When a woman is beheaded in a park outside Rome and her six-year-old son goes missing, the police unit assigned to the case sees an easy solution: they arrest the woman's husband and await his confession.
But the chief of Rome's major crimes unit doubts things are so simple. He hires two of Italy's top analytical minds to solve the mystery: Deputy Captain Colomba Caselli, a fierce, warrior-like detective still reeling from having survived a bloody catastrophe, and Dante Torre, a man who spent his childhood trapped inside a concrete silo.
Fed by the gloved hand of a masked kidnapper who called himself "the Father," Dante emerged from his ordeal with crippling claustrophobia but, also, with an unquenchable thirst for knowledge and hyper-observant capacities.
All evidence suggests that the Father is back and active after being dormant for decades. Indeed, he has left telltale signs that signal he's looking forward to a reunion with Dante. But when Colomba and Dante begin following the ever-more-bizarre trail of clues, they grasp that what's really going on is darker than they ever imagined...