New Yorker, Don Counsell, who is travelling through southern Florida, is being framed by Ernest Riever for a murder he did not commit. Riever is holding the real killer captive on his yacht while detectives are searching for Counsell. Pen Broome, who lives with her father on their rundown estate, tries to help Counsel out. Riever’s men find Counsel and trap him in a ballast bulkhead, but Pen rescues him. Eventually, Counsel is able to prove his innocence and the bad guys are given their due.