Following a brutal attack by her ex-boyfriend, Kate Priddy makes an uncharacteristically bold decision after her cousin, Corbin Dell, suggests a temporary apartment swap - and she moves from London to Boston.

But soon after her arrival Kate makes a shocking discovery: Corbin's next-door neighbour, a young woman named Audrey Marshall, has been murdered. When the police begin asking questions about Corbin's relationship with Audrey, and his neighbours come forward with their own suspic ...