After he's caught stealing drugs from evidence, Aidan Waits is blackmailed into an undercover operation which sends him from the upper echelons of the super-rich to the low-life squalor of Manchester's drug scene. He spends his nights tailing The Franchise, a sophisticated gang operating out of the city's booming bar culture, but when David Rossiter, a powerful member of parliament, discovers that his runaway teenage daughter has turned up in their custody - everything changes.
Isabelle Rossiter has joined the dangerous world of the sirens, the young women who go from bar-to-bar collecting drug money for The Franchise. Each lives in the shadow of Joanna Greenlaw, who cut a deal with the police then vanished without a trace.
As Franchise members begin to die, and a toxic strain of their designer drug hits the market, it becomes clear that someone doesn't want Joanna Greenlaw to be forgotten. His loyalties divided between the police, The Franchise, the sirens and himself, Waits forgets about saving his reputation and tries desperately to save his own life.
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