Amber and her insects are back in a new thrilling adventure with old friends and new villains!

Amber walked along the beach, looking over the sand. Every few metres, she saw a sand flea, or a mosquito, or a rove beetle . . . all dead. What could possibly have killed so many at once?

Something is very wrong in the seaside town where Skydragon is trying to lay low. And it's not just the insects that are suffering; the dolphins and whales are in trouble too.
Something is lurking below the surface of the ocean. But what?
Can Amber and her insects get to the bottom of the mystery before it's too late?