Serena's only ambition is to become a professional pianist. When the opposition from her husband turns into violence, her life falls apart. Should she give up her dream? Her marriage? Or is there a third, unconventional option for her?

Waking to find himself alone with a murdered woman, Eddie Carter - a night shift cab driver with a worrying history of sleepwalking - sets out to discover the killer, desperately hoping it isn't him. His investigation takes him deep into London's seedy night-time underworld.