Based on a real military program! The US Navy's new breed of soldier is ready to make a big splash. From the author of Dog Tags!Navy SEALs are some of the most elite warriors in the world. Trained to operate in sea, land, and air, they work under cover of night to carry out the US military's most sensitive and difficult missions. Cory McNab wanted to be a Navy SEAL, but he washed out of the program. Now he is a member of the Navy's Marine Mammals Program, where he is partnered with a search-and-recovery dolphin named Kaj.Together, Cory and Kaj are the Navy's best hope when a US spy submarine is lost in enemy waters. With the help of Kaj's bio-sonar, they should be able to locate the submarine before its secrets fall into the wrong hands. But the mission gets complicated when a team of Navy SEALs runs into trouble. Can Cory succeed where his heroes have failed . . . or is he in too deep?

Based on a real military program! The US Navy's new breed of soldier is ready to make a big splash. An action-packed, maritime military adventure from the author of Dog Tags. A notorious Somalian pirate sails the Arabian Sea, leading a band of deadly thieves and mercenaries on an international crime spree. When they take American hostages aboard a cargo ship, they've finally gone too far—and a special task force of Navy SEALs and Marines is called in to help. SEALs, Marines . . . and a talented sea lion named Sly. As Sly's handler, young sailor Felix has two important jobs. Job one is to get Sly to plant a beacon so that the U.S. strike force can follow the pirates back to their haven. Job two is to keep the sea lion safe and out of combat. But when the mission goes wrong and the pirates get the upper hand, Felix and Sly end up right in the middle of the action . . . with dozens of innocent lives at stake.

Cory McNab is a proud member of the US Navy's Marine Mammal Program. Along with his dolphin partner, Kaj, he teaches new recruits how to work with their dolphins to locate underwater explosives, intercept enemy swimmers, and otherwise keep America safe. When an elite squad of Navy SEALs deploys to the Black Sea, they need the assistance of every dolphin in Cory's top secret Mark Sixty team. With countless lives at stake, a special task force of SEALs, dolphins, and handlers sets out under cover of night in a desperate effort to stop a war before it starts. But Cory and Kaj soon discover that they're in over their heads. Because the Russian military has a Marine Mammal Program of its own. And their dolphins have been trained... to kill.