From the best-selling author of Our House, winner of the Crime and Thriller Book of the Year Award

You’re feeling pretty smug about your commute to work by riverboat. No more traffic gridlock or getting stuck on the tube in tunnels (you’re claustrophobic); now you’ve got an iconic Thames view, fresh air - a whole lifestyle upgrade. You’ve made new friends onboard - led by your hedonistic young neighbour, Kit ? - and just had your first ‘water rats’ Christmas drinks.

But the first day back after Christmas, Kit isn’t on the morning boat. The river landmarks are all the same, but something’s off. You disembark to find the police waiting. Kit’s wife, Melia, has reported him missing and another passenger witnessed the two of you arguing on the last boat home after your drinks. Police say you had a reason to lash out at him. To kill him.

You protest. You and Kit are friends - ask Melia, she’ll vouch for you. And who exactly is this other passenger pointing the finger? What do they know about your private lives? No, whatever coincidences might have occurred that night, you are innocent, totally innocent.

Aren’t you?