Don Winslow of the Navy #15

When Don Winslow and Red Pennington fly out to rescue the ailing Captain Dahl of the oil tanker Sea Gull, they find themselves in command of an unconvoyed vessel carrying vital high-octane fuel through waters prowled by Japanese submarines. As the ship nears Australian waters, a coordinated enemy attack forces the crew to abandon the sinking tanker, leaving Don, Red, and First Mate Tom Barton adrift in a rubber raft with dwindling supplies—until a mysterious Japanese freighter picks them up with an unexpected proposition. Don's decision to cooperate with the enemy captain leaves his crew questioning his loyalty, setting the stage for a tense battle of wits on the open sea.

After a storm forces their seaplane down on Japanese-controlled Island 23, Don Winslow and Red must not only tend to their wounded pilot but devise an escape before enemy patrols close in. With nothing but razor blades, rope, and gasoline cans, the two sailors improvise a desperate plan to get their vital cargo airborne and strike back at the base that shot them down.

When a gram of stolen radium vanishes from San Diego Naval Hospital—taken by Nazi and Japanese agents—Don Winslow and Red Pennington are assigned to track it down along the coast. What starts as a search for missing medical supplies becomes a race against time when the enemy's true plot emerges: poisoning the naval station's water supply with a deadly radium solution. Winslow must outsmart saboteurs and defuse a lethal trap to stop a catastrophe that could claim countless lives.

Don Winslow and Red Pennington stumble onto a sinister mystery when a panicked sailor flees a toy shop and nearly gets hit by a car—only to be mysteriously scooped up by suspicious men who vanish at the sight of Navy officers. As Don investigates a strange occurrence in the same shop—playing cards mysteriously rearranged—he begins to suspect the incidents are connected by espionage, all aimed at sabotaging the Navy's greatest prize: the newly completed U.S.S. Hawaii, set to launch tomorrow.