The time is set after the last book in the series, Death Sets Sail, and Daisy and Hazel are working on their case from the government. On their way to Paris, with Alexander and George tagging along - in first class - when they go through a cloud. A scream. A yell. Panic. Who has died? Daisy and hazel can not reveal they are working for the government, else they will be the next victim. Can they work together to solve the crime before the plane lands in two days? Or will another person die...