Nelly McDermott, the granddaughter of a prominent politician, loses her husband, architect Adam Cauliff, in a fiery boat explosion. When she's informed that he was murdered, Nell is compelled to find the killer by searching for the truth, with the help of a psychic, which could solve the mystery — or end her life.

The adults decide to bring the babies and Angelica to Las Vegas on vacation. Tommy convinces the babies to help him find the tigers. Angelica hopes to sing while in Las Vegas.