A young man goes to work on a tuna boat to earn money to pay off debts.
When his friend Frankie Pereira fails to place the wager of a ruffian named Ransom at the racetrack and the 10-to-1 longshot wins, Alec MacLennan is left holding the bag after Frankie flees. Forced to pay off the debt, Alec takes a job on the Pereira family's tuna fishing boat.
Frankie's tough brother Silvestre objects to Alec's presence and bullies him. After a while, their sister Bianca notices that the hard-working Alec never has any of his salary. She finds out how he is being extorted by Ransom, who is doing likewise to her brother after finding Frankie working as a stable boy at the track. Ransom's chicanery discovered, Alec is forgiven by all.
