Tessa Quayle, a brilliant and beautiful young social activist, has been found brutally murdered by Lake Turkana in Nairobi. The rumours are that she was faithless, careless, but her husband Justin, a reserved, garden-loving British diplomat, refuses to believe them. As he sets out to discover what really happened to Tessa, he unearths a conspiracy more disturbing, and more deadly, than he could ever have imagined.
Director Fernando Merielles expands the novel's ambivalent angle of view, so that we see London from Kibera as much as Kibera from London.