El mar de los monstruos. Libro segundo, Percy Jackson y los dioses del Olimpo / Rick Riordan ; traducción del inglés, Santiago del Rey. [Boundless electronic resource]
When Camp Half-Blood, the only safe haven for demigods, comes close to being overrun by mythological monsters, Percy must find his best friend Grover, who is prisoner on an island in the Bermuda Triangle, and then set out to save the Camp.