Theme:

Based in 1930s Europe, your character is travelling on board the luxury train The European Belle.

Costume suggestion:

Fashion of the time for ladies was sophisticated evening gowns, along with suede gloves and lots of jewellery.

For the men it was suave 1930s suits with a smart tie and braces, finished off with a trilby style hat.

There is a trophy to be won for the best costume!

Can you work out whodunnit?