The Message (Animorphs , No 4)

It all started with the dreams. But Cassie didn't pay much attention to them. She and her friends had all been having weird dreams ever since they'd first learned to morph. Maybe it was just some crazy side effect.

Then Cassie discovered that she and Tobias had been having the exact same dreams. Dreams about the ocean. And a strange feeling that someone is calling to them. Calling for help. Cassie, Tobias, Jake, Rachel, and Marco have to figure out if the dreams are a message -- or a trap. And if it is a trap, it could mean the end -- for everyone...