DI Jade Tanner has been plunged into managing the Complex Crimes Unit, Police Scotland's newest investigating team. She's recruited Dr Petra McBride, fresh from losing her job at Dundee University, and DS Mo Uddin, who's reluctantly transferred from Birmingham. When America's newest internet billionaire is shot on the shores of Loch Lomond, the team is brought in. Jade suspects a connection with the shooting of a local millionaire, an unsolved case which has been haunting her. But the team has its problems. Jade is only just back at work after a personal trauma, and can barely leave her own front drive. Petra is receiving anonymous phone calls and trying to establish a relationship with the latest in a string of girlfriends. And Mo is missing the city and his old boss DI Zoe Finch. Can the team work together despite their differences and find the killer before the next shooting? Or will the next victim be a member of the Complex Crimes Unit?