The Sea Raiders, a band of foreign agents, led by Carl Tonjes, and secretly by Elliott Carlton, blow up a freighter on which Billy Adams and Toby Nelson have stowed away to avoid Brack Warren, a harbor patrol officer assigned to guard a new type of torpedo boat built by Billy's brother, Tom Adams.
Carl Tonjes and Elliott Carlton, leading the Sea Raiders as foreign agents, destroy a freighter where Billy Adams and Toby Nelson are hiding from Brack Warren, a harbor patrol officer tasked with safeguarding a newly built torpedo boat designed by Billy's brother, Tom Adams.