Terror on the Beach

Terrore In Spiaggia (Terror On The Beach) is an Italian children's book by Cristina Brambilla in the "Misteri A 4 Zampe" series.

Premise
On a beautiful golden beach, Scooby and his friends are waiting for turtle eggs to hatch. But suddenly a terrible monster emerges from the waves, with long tentacles and enormous antennae. Mystery Inc. begins a race against time to save the turtles...