Mr. Hallson is called upon to investigate a drowning in the park. When he is bitten by a rare but poisonous sea snake, neither he nor his wife are able to navigate their yawl. Bud haps upon their craft and contacts his father over the Hallson's radio. Porter gives Bud instructions on setting the sails. With Bud at the prow and Mrs. Hallson at the tiller, Flipper guides the yawl through the treacherous reef. The yawl arrives in port just in time to save Mr. Hallson's life.