Dinosaur Murder by Patricia Bernard
Chapter 1 The floater, as Damien whisperingly called it, drifted closer. Two more rippling waves and it would bump into Abba. She edged away, the pool was small and there was no more room on their submerged ledge. "Can you see it?" shouted a voice. "No," yelled the man who was standing immediately above them on the overhanging rock. Abba wondered if he was the man they'd seen hit the floater with a hammer and continue hitting him as…