Detective novelist Richard Castle (Nathan Fillion) has almost become a "regular employee" of the New York City Police Department. Although it is a headache for Kate Beckett (Stana Katic), the two work well together and are about to become formal partners. However, because Richard investigated Kate's mother's murder without Kate's knowledge, their relationship was once deadlocked. . Now Richard is busy repairing the rift between him and Kate while planning the publication of his next best-selling novel "Heat Wave". Although Kate decided not to associate with Richard anymore, the situation forced them to join forces again to investigate a new mysterious murder case-someone found a man dead in a tree, his body entangled in the branches and leaves of the tree...