 A dignified actor, Billy Bolla, nears retirement and keeps close watch on his pension book, kept in a sealed bottle. On a cruise among Greek islands, while he s the on-board entertainment, he drops the bottle overboard and Snowball, a white dolphin, swallows it. Billy hires a local guide, Sidik, to help find Snowball, who has other pursuers: it has escaped from the pool of the sadistic Marcov, an arms merchant who s been training Snowball for a suicide mission. Billy and an Italian boy, Theo, who s mom is Marcov s maid, must save Snowball (and the cruise ship itself) from Marcov s deadly plan. They also help Theo s mom and keep their eye out for the pension book.