When Juno Browne finds a life-sized effigy floating in the River Ashburn, a note attached claims it as the work of Cutty Dyer, Ashburtons mythical blood-drinking demon. But despite Junos instinct that this is a sign of trouble ahead, the police dismiss her find as a practical joke. Then the body of a woman is discovered by the river and it becomes clear that a killer has taken on Cuttys identity.But as suspicion falls on someone close to her, Juno finds herself drawn into solving the mystery, desperate to prove her friends innocence. As the rain falls steadily and the level of the River Ashburn continues to rise, Juno must unmask the real identity of Cutty Dyer, or risk being swept away on a murderous tide.