You were having dinner on the train. After the murder of Mrs Daunt, there was quite an investigation going on. At least as much of an investigation as it can be while the train is still on track and hasn't arrived at the next destination yet. You finished your meal and walked into your compartment room, where you found two of the other passengers, probably in high school, looking through your stuff. Hazel: Uh- well- uh- w- we can explain- Daisy: -We were looking for a book we had left in here a while ago. Sorry for the disturbance!