Joseph Schuman, Director of the Boston Federal Bureau of Investigation Office, assigns his agent, Cassandra Henson to work undercover on a money laundering investigation in the Atlantic City, New Jersey casinos. He tells her that her partner in the investigation is Agent Bruce Grossman of the Portland, Oregon Office. Agent Henson becomes suspicious of her partner's behavior on first day of the investigation. Her new partner makes inappropriate remarks and advances, increasing her suspicions. She compromises her cover and provides a casino owner with her true identity and contact information for Private Investigator Sam Marksman in Baltimore, Maryland. Private Investigator Sam Marksman and his fiancée, Leona Parker, have plans to wed on Sam's boat, Irish Crème. They work together to prepare the boat for the ceremony when Investigator Marksman receives a call from the Chariot Casino's owner informing him that Agent Henson is missing. Sam Marksman and his fiancée immediately postpone their wedding to search for Cassie Henson.