When a mysterious girl attempts to stake her claim to the Snowcroft family fortune, Myrtle Hardcastle’s father, a lawyer, is asked to help prove—or disprove—her identity. Is this truly Ethel Snowcroft, believed to have been lost at sea with her parents, or a con artist chasing a windfall?

Mr. Hardcastle’s pursuit of the case takes a detour when he’s hospitalized for a tonsillectomy—only to witness a murder. But where’s the victim? And who at the hospital could be harboring murderous intent? Myrtle is determined to find out before the killer comes after her father.

With stakes this high, her sleuthing has put Myrtle, her family, and the patients and staff at the Royal Swinburne Hospital In Myrtle Peril.