Books like Death Department by Bill Knox

A locked‑in murder on the Orient Express forces detective Hercule Poirot to unravel a mystery among a diverse group of passengers during a snowbound night.

In Scotland, Detective Inspector Logan McRae faces a bloody crime spree marked by chained bodies, burning tyre victims, and bone knots outside his home, while rival drug gangs, missing teenagers and escalating tensions test his resolve.

When an acquitted engineer is found dead after a cruise, Scotland‑based investigator Miles Bredon must uncover the truth before a generous insurance payout evaporates.

"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.

In the Shetland Isles, inspector Jimmy Perez and Willow Reeves investigate the mysterious disappearance and subsequent death of friend Eleanor, whose obsession with a local ghost may hide a decades‑old secret worth killing for.

In the small Scottish village of Lochtav, former dustman Fergus Wilson rises to power as a ruthless recycling enforcer, only to die in a shocking act of sabotage—Hamish Macbeth must untangle the crime and his own conscience.

Charles Mortimer has passed down to his descendants, the Collards and the Vandervents, vast wealth, prestige, a successful business and a horrible string of bad luck that began when he built the two eccentric mansions on the fringes of Blackheath. Roger Vandervent, the prosperous manager of the family company, is mysteriously struck down with food poisoning and dies. Only his son Paul suspects murder, and the subsequent disappearance of secret letters written to Roger only confirms his suspicions. In attempting move attention away from his adored Aunt to Isabel, whose relationship with his father was little short of scandalous, Paul plunges into a nightmare of blackmail, adultery, and secret sexual aberrations.