A police mole is about to emerge from the shadows. And no one is safe...For years, a police mole known only as the Ferryman has operated deep within Police Scotland, secretly doing the bidding of Glasgow crime boss Frank Gormley.When a mass shooting rocks a notorious gangster's pub, it looks like a deadly new phase in the turf war between Gormley and his rivals.But when DCI Lomond and his team investigate, all the evidence points to an inside job - and a traitor within Major Investigations itself.With the body count climbing and loyalties fractured, Lomond must decide who he can trust, and what priceless personal cost he's willing to pay to expose the Ferryman once and for all.Because when the Ferryman comes calling, someone has to pay the price.From the bestselling author of The Bonnie Dead, Andrew Raymond captures the voices of his beloved home city, and takes you into its hidden depths.If you like writers like JD Kirk, Ian Rankin, and Val McDermid, this addictive thriller will have you gripped until its devastating final pages.