Books like The Night Window by Dean Koontz

U.S. Marshals Teddy Daniels and Chuck Aule investigate a missing patient on Shutter Island’s Ashcliffe Hospital, only to confront sinister experiments and psychological horrors that threaten their sanity.

Detective Cassie Maddox transfers out of Dublin Murder Squad but is called back to solve a murder that looks almost identical to her past self.

Alex Cross, the FBI agent, returns as a psychologist in D.C., tracking a serial rapist that resurfaces from a past case involving his wife's murder.

The Women’s Murder Club confronts an old enemy, a body‑bomb killer and sixteen terrorists aboard a cruise ship bound for Alaska.

A mother's nightmare returns as she discovers her children are missing in Cape Cod, Massachusetts, and must confront the shadowy figure who murdered her first children.

An eleven-year-old boy’s corpse is found in a park, and all evidence points to Flint City’s beloved coach, Terry Maitland. A detective’s quick arrest leads to a tense investigation where DNA, alibis, and hidden truths collide.

A psychiatric ward mystery twists into a conspiracy over a Soviet mind‑transfer procedure, as a patient claims to be former scholar Dr. Nicholas Slopen, sparking questions of identity and authenticity.

Nola Brown, presumed dead after a mysterious plane crash, is revealed alive by former Navy SEAL Jim "Zig" Zigarowski, forcing them to evade a secretive U.S. military conspiracy while uncovering hidden truths.

Lindsay Boxer, a seasoned San Francisco policewoman, tackles a series of mysterious heart attacks while helping prosecute a bomber with a cunning defense team.

A college student is accused of murder, leading to the revelation of her multiple personalities.

Rogue FBI agent Jane Hawk, a former elite investigator, races across the United States to expose a deadly conspiracy that killed her husband and threatens millions.

Jess, a high‑school sophomore, investigates the mysterious death of her twin sister Anna after she falls from a bedroom window, uncovering secrets she never suspected.

Emma Davis, a rising New York artist, returns to the reopened Camp Nightingale as a painting instructor to uncover the truth behind her friends' disappearance, confronting hidden secrets and dangerous threats that may exact a deadly cost for closure.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

FBI agent Jane Hawk, now a fugitive, must protect her five‑year‑old son from relentless enemies that close in on her home, testing her courage, wits, and discipline in a deadly labyrinth of terror.

A murder mystery at a high-security boarding school turns deadly, leaving detectives Rizzoli and Isles to unravel the truth.