Retired gentleman spy and horticultural aficionado Ethan Blackwell thinks the biggest mystery he faces is winning Best in Show with his prized chrysanthemum, Mummy, at the National Flower Show in Town.

But when Ethan arrives with Mummy and head gardener Clarence Grubb, he finds more than flowers are blooming. Overnight, a thief has struck, and not just Mummy, but several top prize plants have vanished without a trace.

Ethan calls upon his trusted allies, the formidable Mrs. Pemberton and the perpetually annoyed Head Constable Shirty, to help crack the case. But the theft is just the beginning of a deeper plot.

As Ethan trails a series of cryptic clues leading to Town's seedy underbelly, he discovers a twisted scheme targeting the National Flower Show. The stakes are raised when Mummy and Ethan's lives are put in jeopardy.

To rescue his prized flower, Ethan must outwit a criminal mastermind and unravel a conspiracy within the hallowed gardens of the Royal Gala Coliseum. But are Ethan's horticultural knowledge and mechanical advantages enough to stop the nefarious blooming crimes before it's too late?