Taking the waters has never been more delicious--or dangerous...

When a mysterious invitation for a spa holiday arrives for Miss Phryne Fisher from an unknown retired Captain Herbert Spencer, Phryne's curiosity is piqued. Spencer runs a retreat in Victoria's rural spa country for shell-shocked veterans of World War I. It's a cause after Phryne's own heart, but what can Spencer want from her?

Phryne and her faithful servant Dot set out for Daylesford, viewing their rural sojourn as a short holiday. While Dot gets to know the remarkable women who run the hotel where they are lodging, Phryne enjoys an enticing meal--and dessert--with the attractive Captain Spencer. But their relaxation is short-lived as they are thrown into treacherous Highland gatherings, a mysterious case of disappearing women, and a string of murders committed under their very noses. Meanwhile, back at home, Phryne's three wards are busy solving a mystery of their own when a schoolmate is found floating facedown near the docks--and pregnant at the time of her death.

With her usual pluck and deft thinking, Phryne methodically investigates the strange goings-on in this anything-but-tranquil spa town.