Supermodel Lula Landry falls to her death from a Mayfair balcony. The police conclude that she committed suicide. Robin Ellacott, a newly engaged 20-something temp from Yorkshire, is sent to the Denmark Street offices of private investigator Cormoran Strike. It is an awkward first meeting. Then John Bristow arrives. He believes that his adopted sister Lula was murdered and the police have overlooked key evidence. Penniless, and effectively homeless after separating from his girlfriend, Strike takes the case. Strike meets Derrick Wilson, the doorman at Lula’s exclusive flat, and learns that another resident, Tansy Bestigui, heard Lula arguing with someone just before her death. Tansy later changed her testimony. Lula's driver, Nico Kolovas-Jones, mentions that on Lula’s last day she visited a luxury boutique with a friend called Rochelle Onifade. They'd been looking at a piece of paper which was going to enrage her family. Meanwhile, Robin finds out about Strike’s colourful past as an unlikely war veteran, and the son of a groupie mother and infamous rock star father. The police warn Strike that John Bristow’s suspicions are absurd. When Strike arrives at a dinner arranged with Tansy, he is greeted by her lawyer (who is also John and Lula’s uncle) Tony Landry, who warns Strike to stay away. Strike tracks Rochelle, believing her to be in danger. And while she clearly has key information she is also reluctant to talk... Strike: Cuckoo's Calling - Sunday at 9.05pm on BBC One. Photo: BBC/Bronte Film & TV Ltd/Steffan Hill.