Alex Callister Books in Order

Undercover agent Winter has two weeks to stop a criminal mastermind from broadcasting an innocent girl's murder. Posing as an assassin, she infiltrates his organization, only to discover that her elusive target knows secrets from her past.

A murdered young woman carries a message intended for Winter, leading the agent toward a notorious contract killer called the Guardsman. To expose him and reach crime boss Alek Konstantin, Winter commissions a hit on herself.

An online assassination game selects a New York senator as its next target, and Winter arrives from London to protect her. Surviving the night requires uncovering who controls the hunt and what its sinister rules conceal.

The collapse of an assassination marketplace leaves dangerous killers without leadership, while Winter investigates apparently disconnected acts of violence. Secrets within GCHQ and unanswered questions about her own past complicate her attempt to identify the guiding hand.