Percy Jackson y el cáliz de los dioses (Percy Jackson y los dioses del Olimpo, 6)

Percy Jackson knew getting into college wouldn't be easy, but having to get letters of recommendation from three Greek gods was perhaps a bit much. And, as if that weren't difficult enough, he'll have to complete three missions to get them. The first is to find the chalice of a rather absent-minded god, and it's not just any chalice: if a human drinks from it, they'll gain immortality. Percy, Annabeth, and Grover have just enough time to find it before it falls into the wrong hands and all hell breaks loose.