Books like The Light of the Fireflies by Paul Pen

When Libby Day’s family is brutally murdered, she blames her older brother Ben, who is imprisoned for life. Twenty‑four years later, a coaxing group suggests Ben’s innocence and forces Libby to revisit the night’s trauma and unravel the truth.

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.

A husband’s new engagement unexpectedly draws a determined ex‑wife into a web of lies, secrets, and psychological tension that threatens the lives of all involved.

"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.