From the critically acclaimed author of Float and Glitch
comes a new standalone adventure under the sea, perfect for fans of Gordon
Korman and Dan Gutman!

Berkeley and her best friend, Garth, live on an old cruise
ship, scavenging for supplies from the drowned cities left behind on the ocean
floor after the sea swallowed up all the land. They think they’ve seen every kind
of aquatic creature, but they never expected to find sea monsters…


After awakening a Hydra, Berkeley and Garth are sent to live
on a submarine, where they study and hunt sea monsters. But the Hydra wants
revenge on their home ship—and if it succeeds, their families will go down with
it.


Berkley, Garth, and their crew must find a way to save the
ship. But monsters aren’t the only deadly things lurking in the ocean’s depths.