Miss Merula Merriweather is not like other women her age: instead of hunting for a husband at balls and soirees she spends her time in a conservatory hatching exotic creatures. As the Royal Zoological Society won't accept a woman's accomplishments, she has her uncle Rupert take credit for her achievements. But at a zoological lecture, the guest of honor dies after contact with one of Merula's butterflies, and Merula's uncle is arrested for murder....