A family of Hasidic Jews dies suddenly while picnicking in Finsbury Park, and the finger is quickly pointed at a gang of Islamist youths. Too quickly, thinks local reporter Rex Tracey. Rex starts to investigate. But when his long-time colleague and friend is also accused of murder, the sleuthing journalist with a fondness for Polish lager and dry one-liners is catapulted out of his depth, into a disturbing world of religious fanaticism, false prophets and century-old secrets.