Civil engineer Warren Neale rescues a badly wounded Allie Lee after her family is killed in an Indian massacre. Falling in love after nursing her back to health, Warren must yet again save Allie when she is kidnapped by a dangerous bandit.
The Allen spinsters adopt Bradley Nickerson, who grows up with Gussie Baker, the little girl next door. Fifteen years later he is first mate of the Thomas Doane, owned by Granny Baker. A plot to sink the ship is averted by Bradley and a sailor, but ultimately the ship is sabotaged.
Two sets of young marrieds, Day & Fanny Illington and Ferd & Ida Jackson take a weekend trip together. Avid golfer Day ignores Fanny as Ida does Ferd. At his suggestion he and Fanny attend an island "affinity" party for people neglected by their spouses. Accidentally left on an island they struggle back to the mainland only to discover Day and Ida have been having an affinity party of their own! Everyone realizes the error of their ways and resolves that they were already married to the ones with whom they had the most affinity.
