Leo the Guppy loves his home at See the Sea Aquarium. He really enjoys when all the families come to visit and watch him and his guppy friends in their tank. So, when he finds himself accidentally placed in a lobster tank, he panics. Surrounded by strangers in a place he doesn't know, Leo wants to run, hide or do anything he can to get back home.

Once he calms down, makes new friends and starts to enjoy himself, he realizes new places and new faces are not always so bad. Just like some of the boys and girls that read this book, Leo finds out that there is a big world out there to discover and being scared will mean you might miss out on having fun, making friends and trying new things.