Proteus, leader of the mysterious Guardians, traps the Aronnax in a magnetic field and kidnaps Ant, believing he is the key to finding Lemuria. Ant thinks Proteus is crazy. He tries to escape to save his family.

Can a fish really be responsible for wrecking Dolos's boat, sinking the Aronnax, and almost destroying the Rover? Fontaine believes so-and it's invaded Jeffrey's home on the Aronnax. How can she get rid of it and its bad luck?