Madeline Mona Moon is not your typical young lady. She is a cartographer by trade, explorer by nature, and adventurer by heart.
She has inherited a fortune from her uncle and is one of the richest women during the Great Depression. But there's a problem. Mona attends an elegant party given by Elspeth Hopper, the daughter of a world-renowned archeologist of Egyptian Queen Ahsetsedek IV's tomb. Not long afterwards, Elspeth's maid is found murdered, and the local sheriff considers Mona a suspect. That doesn't sit well with Mona. She's determined to clear her name and find out who killed the maid and why. When she discovers the low-down varmint, she'll take care of him her way! She doesn't carry a gun in her purse for nothing. That's how Mona does things in 1934.