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Izzy Spellman is the middle child in Lisa Lutz's San Francisco family of private investigators, where surveillance is both work and a family habit.

Inspector Evariste Clovis Desire Pel is Mark Hebden's irascible police detective in a Burgundy-set mystery series.

Inspector George Felse is the police inspector at the center of Ellis Peters's contemporary British mystery series.

Inspector O is the Pyongyang investigator in James Church's six-book political crime and spy series set in North Korea.

Izzy Palmer is Benedict Brown's accidental amateur sleuth, whose knowledge of classic detective fiction shapes a run of comic English murder cases.

Inspector Pekkala is Sam Eastland's former tsarist investigator, recalled from a Soviet labor camp to work for Stalin.

Isaac Race is the young survivor at the center of Scott Medbury's After Days Trilogy and its America Falls continuation.

Ian Bradley is the Wall Street broker at the center of Lauren Layne's Hot Asset, the first 21 Wall Street romance.

Inspector John Rebus is Ian Rankin's Edinburgh detective in a long-running Scottish crime series.

Inspector Jules Maigret is Georges Simenon's Paris commissaire, known for patient investigations into the lives around a crime.

Inspector Alan Banks is Peter Robinson's Yorkshire detective in the long-running Inspector Banks crime series.

Ivar is a dragon-shifter who takes a central role in Coreene Callahan's Villains of the Dragonfury spin-off.