From the attic of Lyntons, a dilapidated English country mansion, Frances Jellico sees them--Cara first: dark and beautiful, then Peter: striking and serious. The couple is spending the summer of 1969 in the rooms below hers while Frances is researching the architecture in the surrounding gardens. But she's distracted. Beneath a floorboard in her bathroom, she finds a peephole that gives her access to her neighbors' private lives. To Frances's surprise, Cara and Peter are keen to get to know her. But as she becomes entangled in the lives of the glamorous, hedonistic couple, the boundaries between truth and lies, right and wrong, begin to blur. And a small crime brings on a bigger one ...