A British police detective hunts for a killer, and the danger may be closer to him than he knows...

He's supposed to be on his annual leave in Lake Windermere, but Detective Inspector Denis Hamilton has just been dragged into a gruesome murder investigation. A handwritten note, with a woman's name, is found inside the corpse.

When a direct link to London is identified, Hamilton must race against the clock to make the connection before the body count rises. Meanwhile, four friends with strained relationships are reunited. What past event do they want to keep buried—and is there something linking them to the murders?

Then, when a person from Hamilton's past returns, he must ask himself how well any of us can really know our friends...