Cormoran Strike is a down-on-his-luck private investigator, with few clients, in debt, just coming out of a breakup, and living in his office. A former soldier in Afghanistan who lost his leg to a land mine, Strike is hired by John Bristow, the brother of famous supermodel Lula Landry, called the Cuckoo by her friends. Bristow wants Strike to investigate his sister's supposed suicide: she fell to her death several months prior. Strike is helped in his quest by his enterprising temporary secretary Robin, whose boyfriend Matthew, an accountant, detests the very idea of her working for a detective.