"The Cuckoo's Calling" is a detective novel written by Robert Galbraith, a pseudonym for J.K. Rowling. The story follows private investigator Cormoran Strike as he investigates the mysterious death of supermodel Lula Landry, who fell from her apartment balcony. Initially ruled a suicide, her brother believes she was murdered and hires Strike to uncover the truth. As Strike delves into Lula's life, he encounters a web of secrets involving her family, friends, and the fashion industry. The novel explores themes of fame, mental health, and the complexities of human relationships, all while maintaining a gripping mystery.