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Sean Duffy is a Catholic detective in the predominantly Protestant Royal Ulster Constabulary, and Lawson is his Protestant sergeant. In The Cold Cold Ground, they investigate a serial killer against the backdrop of the Troubles in Northern Ireland.

Wallander is an introspective Swedish detective, while Höglund is a young rookie detective. Together in Faceless Killers, they solve a brutal double murder with xenophobic motives.

Holmes is the brilliant detective with exceptional deductive powers, while Watson is his loyal companion and chronicler of his cases. A Study in Scarlet introduces the characters and their unique dynamic while dealing with the mysterious murder of Enoch Drebber.

Detective Superintendent Dalziel is a brash, insensitive veteran detective, whereas Sergeant Pascoe is his younger, better-educated sidekick. In A Clubbable Woman, they work together to solve the murder of a rugby player's wife.

Lincoln Rhyme is a quadriplegic forensic criminalist, and Amelia Sachs is an intuitive police officer. In The Bone Collector they work together, with Sachs acting as Rhyme's eyes and legs, to track down a serial killer who leaves bones as his calling card.

Flavia is an 11-year-old aspiring chemist and detective, while Dogger is the de Luce family's faithful servant and Flavia's confidante. In their first case, they investigate a series of events that begins with a dead bird and a rare stamp.

Easy Rawlins is a World War II veteran turned reluctant PI, and Mouse is his trigger-happy childhood friend. In Devil in a Blue Dress, they navigate the complex racial landscape of 1940s Los Angeles to find a missing woman.

Blomkvist is an investigative journalist, and Salander is a genius computer hacker with a troubled past. They collaborate in The Girl with the Dragon Tattoo to solve a 40-year-old disappearance, which unravels a deeper family conspiracy.

Inspector Alleyn is a gentleman detective of Scotland Yard, and Nigel Bathgate is a journalist that often finds himself involved in Alleyn's cases. A Man Lay Dead involves a murder during a country house party game that turns deadly.

Tommy and Tuppence are a young, adventurous couple who start a detective agency. In The Secret Adversary, they are hired to find a missing woman which leads them into a world of espionage and political intrigue.

Poirot is a meticulous and brilliant Belgian detective, and Hastings is his bumbling but loyal friend. They meet in this book during World War I, and their first case involves solving a poisoning at Styles Court.

Lord Peter Wimsey is an aristocratic sleuth whereas Harriet Vane is a mystery writer accused of murder. First collaborating in Strong Poison, Vane and Wimsey combine their wit and resources to prove Harriet's innocence.

Nick is a retired private detective and Nora is his wealthy, playful wife. Their relationship is filled with witty banter and mutual respect. In The Thin Man, they investigate the disappearance of an inventor and stumble upon a murder.