The fourth Cormoran Strike book has a complex plot and, as in previous books, the evolving relationship between Cormoran and his associate Robin is central to the story. In many ways, this is a superb procedural book: how are clues discovered and interpreted? The procedural emphasis is reminiscent of Michael Connelly’s detective Harry Bosch. But the real joy in this Galbraith book is how Cormoran and Robin interact, how ideas and theories are discussed and debated (much like Inspector Lynley and Havers in the E. George mysteries). Both characters are completely dissimilar and have some significant human frailties that are often endearing. Finally the choice of certain words requires the use of a dictionary, a delicious practise that I find completely satisfying. Violence is minimal; this is an excellent book about plot and motive.