A botanist comes home with a flower worth killing for and three people who know it.
A botanist has spent two years in the highlands chasing a rumor and is coming home with a living specimen that could cure a disease or start a war between two companies. On the slow coastal steamer home the botanist is joined by a doctor with a mysterious letter, an insurance investigator who never approves a claim, and a magician who is very interested in the botanist's luggage.
4 roles. You take one; your friends take the rest, and the narrator plays any left over. Anyone can bring a character of their own into a role instead.
A botanist returning from a failed expedition with one specimen she would kill to protect.
A ship's surgeon turned village doctor, called out of retirement by a letter he will not show anyone.
An insurance investigator who suspects everyone of fraud, usually correctly.
A stage magician whose act depends on a secret she stole.