Alejandro de Yepes and Jes's Rocamora, young officers in the Spanish regular army, are stationed alone at Castillo when, out of nowhere, a friendly redhead appears to them in the cellar. There is something magnetic and deeply mysterious about this Petrus. Alejandro and Jes's are bewitched, and, in the middle of the sixth year of the longest war humankind has ever endured, they abandon their post to follow him across a bridge only he can see. Petrus...