Stine, R. L

Something dead has been here. Gabe just got lost in a pyramid. One minute, his crazy cousin Sari was right ahead of him in the pyramid tunnel. the next minute, she'd disappeared.

This year there's something really scary going on under the sea. The fish all seem to be growing, bigger and bigger, into monster-size sea creatures, with monster size appetites.

Gary's dream is about to come true. He's going to exchange bodies with another kid for a whole week. He can't wait to get his new body until something horrible happens and Gary finds out that his new body isn't exactly human.

When Billy and his sister Sheena spend a summer at their uncle's sea lab, they discover something strange about the fish.