Taking a break from practicing for a holiday dance performance to accompany her friend Davy to the beach, Maryellen finds a barnacle-encrusted ring buried in the sand that looks like lost treasure and is desperately sought by a group of strangers.
When a dashing man from Mexico City brings Tia Dolores a ruby ring for Christmas, Josefina notices that things start going wrong and she decides to get to the bottom of the mystery.