An FBI agent vanishes while tracking a Boston serial killer. Six years later, she is found in a cabin in the woods with no memory of what happened.
Her husband has remarried and her son is being raised by his new wife. She must navigate her new reality and becomes implicated in a new series of murders.
Richard Castle is a successful murder-mystery writer who becomes involved in solving crimes after a copycat killer starts recreating murders from his books.
Working with NYPD detective Kate Beckett, Castle uses his unique perspective to help solve cases while also trying to find inspiration for his next novel.