Robert Lowery (as Joe Beck) has been sweating it out in Central America for six years; then, his grandfather dies, and leaves him $200,000. Mr. Lowery is directed to sail for Galveston, Texas, on the "Southern Queen", to claim his inheritance. On the docks, he overcomes an attacker; then, after leaving the thug for dead, Lowery endeavors to take an earlier boat. Some mysterious whispering among passengers portends trouble for the voyage; still, Lowery takes the trip.
Inevitably, Lowery faces danger on board; and, of course, strikes up a romance with the mysterious Phyllis Brooks (as Nita Paxton). Lowery and Ms. Brooks make an attractive film couple. Brooks was once a model, and it shows. Later, Lowery would be cast as filmdom's second Batman, which is understandable. Charles Arnt (as Daniel Bergstrom) is an intriguing villain, or is he? The film's attempt to tie up every loose end is unsatisfactory.