Phryne Fisher, her sister Beth, and her faithful maid, Dot, decide that Luna Park is the place for an afternoon of fun and excitement with Phryne's two daughters, Ruth and Jane. But in the dusty dark Ghost Train, amidst the squeals of horror and delight, a mummified bullet-studded corpse falls to the ground in front of them. Phryne Fisher's pleasure trip has definitely become business.