As inspector Jefe Javier Falcón investigates a faceless corpse unearthed on a municipal dump, Seville is rocked by a massive explosion. An apartment block is destroyed, and when it's discovered that its basement housed a mosque everybody's terrorist fears are confirmed.
Panic sweeps the city. More bodies are dragged from the rubble. And the climate of fear infects everyone, as terror invades the domestic life of flamboyant judge Calderón and the troubled mind of Consuelo, Falcón's one-time lover.
With the media and political pressure intensifying, Falcón realizes all is not as it appears. But as he comes close to cracking a conspiracy, he discovers an even more terrifying plot – and the race is on to prevent a catastrophe far beyond Spain's borders.