10 Must-Read New Mystery Books for Summer 2026—’Unputdownable’ Thrillers by Nora Roberts and More!

Is there anything better than that blissful feeling of cracking open a brand-new book while lounging in the sunshine? Between the blue skies, balmy long weekends spent at the beach or the lake—or even relaxing on the couch in the crisp A/C—there’s something extra enjoyable about reading in the summer. This season is always huge for book releases of all kinds, but mysteries are an especially buzzy genre this summer, with a slew of new releases from bestselling authors Nora Roberts, Kimberly McCreight and more. If you’re looking for new mystery books to read during the summer of 2026, you’re in the right place! We combed through dozens of new releases and hand-picked a wide range of must-reads—some by big-name authors, some under-the-radar gems and even a standout debut!

Are you in the mood for an eerie London-set suspense tale? You’ll flip for Catherine Steadman’s newest novel, Nine Lives. More interested in a dual-timeline mystery set at a real-life 1960s women’s prison? Try Heather Marshall’s Liberty Street. For those who love juicy small-town thrillers that read like summer escapes, dive into Lina Patton’s dazzling debut, The Lake Club. For all of our must-read new summer mystery books, keep scrolling!

‘The Ending Writes Itself’ by Evelyn Clarke

When Stephen King read The Ending Writes Itself, he declared it “in the running for the best mystery of 2026.” Say no more! The twisty debut from V. E. Schwab and Cat Clarke—writing together as Evelyn Clarke—enthralls. When legendary novelist Arthur Fletch dies with his final book unfinished, six writers are summoned to his remote Scottish island for a competition to craft the ideal ending. The eerie hitch: They have just 72 hours to do it.

What readers are saying: “I loved the idea that it was written by one of my favourite authors, V.E Schwab, along with her friend, screenwriter and author, Cat Clarke. Two such authors writing about the world of writers and publishers had to be good, and it was. Another bonus for me was that it is set in an Agatha Christie type of scenario, the locked room being the island. And of course mystery is also my favorite genre.”

‘The Forgotten Midwife’ by Laura Anthony 

Laura Anthony, author of The Women on Platform Two, writes powerful and poignant historical fiction novels. And her newest is an unforgettable story that begins in New Jersey in 2023. Riley Carmichael was raised by her grandmother Betty, who is facing dementia. In a lucid moment, Betty hands Riley a birth certificate for a baby born in Ireland in the 1950s. Puzzled, Riley heads to Ireland to find out who the baby was and what all of it has to do with her. What she learns changes everything. A dual-timeline story of sisterhood and secrets.

What readers are saying: “This was an emotional and thought-provoking story. I listened to this on audio and thought it was well done. I loved the courage of both women, especially Margaret. The dual timelines kept the mystery unfolding at a steady pace, and both Riley’s search for answers and Margaret’s courage made for an engaging read.”

‘The Final Target’ by Nora Roberts

There’s something so quintessentially summer about slathering on sunscreen poolside and getting lost in a  Nora Roberts novel. The legendary author has sold more than 500 million books and is revered for her romantic suspense stories starring strong female characters—and her latest novel follows suit! The Final Target centers on rising author Arden Bowie. Arden meets a fan at one of her book events, but his attention turns violent. Arden flees to a quiet Oregon town where she soon meets Gideon, an ex-LAPD detective. As she tries to heal, past threats resurface again.

What readers are saying: “This leans more thriller than mystery but contains elements of both—and wow! I forgot that romantic suspense/thriller is a genre. I honestly haven’t read a Nora Roberts novel since I was 14, so picking this up felt a little like coming home. And what a homecoming it was. I can’t wait to read more!”

‘Based on a True Story’ by Sarah Vaughan

Fans of atmospheric locked-room mysteries, this one’s for you! Sarah Vaughn, author of the 2018 bestseller Anatomy of a Scandal, has a knack for writing compelling psychological thrillers—and her new novel follows suit. Famed children’s author Dame Eleanor Kingman has invited her loved ones to her cliffside home for her 70th birthday gathering. But on the eve of the bash, she receives an email threatening to expose a secret she kept buried for 50 years. Is it finally time to tell the truth?

What readers are saying: “A dead body is found on the beach…The last part of the book really heats up and I couldn’t turn the pages fast enough! There’s plenty of tension, resentment and a long list of suspects. Eleanor’s dog is a loveable character but most of the humans were questionable. An engrossing dysfunctional family drama with a great atmospheric setting.”

‘Someone Else’s Husband’ by Kimberly McCreight

If you enjoy simmering suspense and character-driven plots, you’ll tear through this one, on sale June 16, by bestselling author Kimberly McCreight. Gretchen is a picture-perfect Park Avenue mom and wife to Richard. Meanwhile, Frankie is on the brink of success with an art exhibition that will finally free her from her past. To celebrate this occasion, she decides to climb Kilimanjaro, where she meets Richard. What follows is a brutal and totally unexpected murder that Gretchen must try to unravel.

What readers are saying: “A fantastic character-driven mystery that once got going was impossible to put down!”

‘Whose Body in the Library’ by Eva Gates

When it comes to mysteries, there’s a very wide array of subgenres and if you prefer ones on the cozier side, pick up Eva Gates’ latest book, the 13th installment of her beloved Lighthouse Library series. Lucy McNeil is busy juggling mom life and her role as library director. Meanwhile, librarian Nichelle Gilchrest’s first day of work is going well. That is…until she finds a body on the steps—that resembles her missing father. Now, Lucy, a seasoned sleuth, vows to help crack the case!

What readers are saying: “I wasn’t quite sure what to think when I realized this story would focus on a new character instead of Lucy, but Nichelle quickly won me over. She is a wonderful addition to the Bodie Island Lighthouse Library family, and her complicated family history made for a fascinating mystery. There was so much drama, emotion, and suspense woven throughout the story that I was completely captivated.”

‘The Chateau on Sunset’ by Natasha Lester

Natasha Lester is known for her glamorous, globe-trotting novels—like The Three Lives of Alix St. Pierre and The Paris Seamstress—about extraordinary women. And her newest book is a stunning, moody reimagining of Jane Eyre. Set against the glittering decadence of 1950s Los Angeles, the story follows orphaned Aria Jones, who is sent to live with her aunt at the storied Chateau Marmont. A sweeping, secret-filled saga.

What readers are saying: “Natasha Lester transports readers into the glittering, intoxicating world of Golden Age Hollywood in The Chateau on Sunset, where starlets and movie gods reign and secrets are as carefully curated as public personas. While the novel is inspired by Jane Eyre, I came to it without that frame of reference, and it stands well on its own.”

‘Liberty Street’ by Heather Marshall

An eerie dual-timeline mystery set at a real-life 1960s women’s prison unfolds in this page-turner. In 1961, a magazine assistant goes undercover inside a women’s prison after receiving a shocking letter from an inmate. In 1996, detective Rachel Mackenzie is tasked with investigating human remains at the prison. Inspired by true events, it’s a tale about secrets and the power of female connection.

What readers are saying: “Utterly captivating. I found myself sneaking extra pages in whenever I could. Heather Marshall writes with urgency and passion about the injustices placed on women’s lives and weaves it into a story that will latch onto your mind, with characters so real you’ll want to reach through the pages to shout at them, but also to ache and cry and root for them.”

‘Nine Lives’ by Catherine Steadman

When fellow bestselling author Lucy Foley read Catherine Steadman’s new novel (on sale June 23) she raved that it “more than delivers on the brilliant twists and thrills.” After a divorce, Frankie starts over in an upscale London area with Blue, her Persian cat. One night, Blue comes home wearing a collar scratched with the words “help me.” To investigate, Frankie uses a “cat cam” collar and uncovers the truth about her neighbors. 

What readers are saying: “This book took a thriller, added a cat with a camera and made it a unique and interesting story. There were even chapters from Blue, as well as a few other neighbors. The ending, especially the epilogue, were great. I really thought I had the ending pegged, but I was completely wrong! Three huge surprises at the end really impressed me and made the book that much better.”

‘The Lake Club’ by Lina Patton

If you’re a fan of super juicy, fast-paced summer thrillers, we recommend Lina Patton’s sharp debut, The Lake Club (on sale June 16). Danika Crawley has it all: beauty, wealth, a husband and two perfect kids. Meanwhile, Augie Elling returns home to Aldon Lakes to lick her wounds after a post-grad scandal. Danika and Augie have almost nothing in common—except they’re both obsessed with Danika’s male nanny, Chat. A tense, drama-filled beach read!

What readers are saying: “The Lake Club is exactly the kind of juicy, addictive summer mystery read that begs to be packed in a beach bag or tossed into a pool tote. Lina Patton leans fully into the glossy drama, messy relationships, and suburban scandal in a way that feels delightfully soapy without ever taking itself too seriously.”