Waldo and Connie decide to investigate a strange incident at the aquarium. The secret they uncover is even greater than they imagined possible ... can they help the owners of the aquarium to keep it hidden safely?

And who is the mysterious person that is following them? Is it someone who wants to protect them or someone they should be afraid of?

Enjoy this collectable adventure series from bestselling author Jaco Jacobs - now with sprayed edges.