Kate Priddy makes an uncharacteristically bold decision to move from London to Boston, after her cousin, Corbin Dell, suggests a temporary apartment swap. 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 suspicions, a shaken Kate has few answers to tell…