Prok Zandin has two chances to qualify for advanced cadet training and he just lost one.

Stuck at the bottom of the class system on the underwater planet Krador, fifteen-year-old Prok needs this training to become a Sea Warrior, a position with automatic social advancement into Krador's upper class plus a hefty paycheck to fund his disabled sister's medical procedure.

Prok is determined to win his final qualification fight until his best friend Makky disappears. With time running out for both his future and his friend, Prok embarks on a dangerous deep-sea rescue and discovers Makky's life isn't the only thing at stake. It's up to Prok to prevent disaster, but action will cost and the price may be everything.