The Unicorn and the Wasp

Location: England, Earth
Date: December 3rd 1926
Enemies: Vespiforms
The Doctor and Donna's meet Agatha Christie at a manor owned buy Lady Eddison. When Agatha Christie goes missing and a body turns up in the library the adventure turns into a pulp sci-fiction murder mystery, with a murder, a jewel thief, and a wasp alien. Can they solve the mystery?