A nanny, in order to give in to the invitation of a suitor who proposes a motorboat trip, leaves her child unattended on land. The trip ends in a dramatic dive into the water, and while the two inexperienced navigators are picked up unconscious by some fishermen, a good devil takes the little boy with him, whom he finds abandoned and crying on the shore. However, the disappearance is believed to be the result of a kidnapping and the poor devil, identified, risks going through a bad time if the nanny and her suitor, who have recovered, do not rush to justify him in time. The nanny finds in her marriage to her helmsman the compensation for the dismissal by the child's parents, and the good devil secures an honest job.
