The Fighting Yank [Bruce Carter III]; Bruce Carter I (the III's ancestor); Joan; Jim Hibbon (salvage company owner/operator, introduction); Davis (salvage diver, introduction); Henry Galwood (villain, introduction); Madden (villain, introduction); Schwert (villain, introduction)
A salvage operator feels that his ship and operations are jinxed, as he attempts to salvage a ship that was recently torpedoed and supposedly is carrying blueprints aboard for a new radar device.
Pyroman [Dick Martin]; Joyce; Commander Alex Thompson (Joyce's uncle); Riesland (villain); Hans (villain); Juan (villain); other ex-Nazis (villains, introduction for all, some die)
Joyce's uncle invites Joyce and Dick along to an assignment of his in Mexico only to have a group of ex-Nazis kidnap Joyce, convinced that she knows something about her uncle's mission in country. They believe it is all about building a secret airbase near Acapulco. Pyroman ferrets out the criminal's island stronghold and deals with them post haste.