Father Simon Westerholt and ex-commissioner Lucia Storm find themselves in the crosshairs of a serial killer unlike any they've ever encountered… Egon Kaplan is a legend—at least on paper. The leading expert on "impossible crimes" has dedicated his life to the highest class of detective novels. But then theory suddenly becomes gruesome reality: Egon's own daughter falls victim to a murder—so enigmatic that it defies everyone's imagination. And that's just the beginning. Before Egon can process the initial shock, the murderer strikes again. Fortunately, Father Simon Westerholt, celebrated by the press as the new Father Brown, has just been transferred to the neighboring monastery—a punishment from his cardinal, who found his detective work and constant snooping “unbecoming for a man of God”…