A group of archaeologists asks Tarzan to help them find an ancient city in a hidden valley of women. He refuses, but Boy is tricked into doing the job. The queen of the women asks Tarzan to help them.
Marianne falls in love with con man Valentine who uses their relation to get her father's endorsement on a money-raising scheme. He runs off with the money and Marianne, later dumping her. Her sister Laura loves Dr. Lindley although she knows he loves Marianne. Marianne returns and marries a wealthy young man, and Lindley turns his love toward Laura.
A man listens to his wife and fakes his own death so that she can get her hands on his insurance policy.
