Who will find Kat first - her friends or her killer?

Ross has a swanky penthouse in London and a high-flying job in the City. Romance has eluded him until he meets Kat. When she disappears, he's devastated.

Young graduate Amy is worried about her flatmate. She doesn't know what's happened to Kat, or why a knifeman wants to kill her. She can't stand Ross, but he's her only hope of solving the mystery - and when he's accused of fraud, only Amy can help him.

The stakes are high and the action lively in this stunning thriller set in central London and the secret byways of...