The first book of the series! This cover repurposes the box art for Grimlock and Bumblebee as well as offering a very faithful image of Frenzy.
The title of this book, and Grimlock's presence on the cover, belie the fact that most of the (possible) book is occupied with an undersea infiltration of the Decepticon base. And there's dolphins.
This cover is the only image of this series that I didn't scan myself, as the glossy, reflective cover prevented my scanner from getting a good image of it. I borrowed this image from Salt-Man Z