They were all impersonated by The Murderer
They were found out because of Reflections through Glass
Were They all found out because the imposters were wearing their Hats the wrong way?
And the people who spotted it remembered how the real people wore their Hats
You mean Roger Bassington-French Mimicked Dr Nicholson.
Tommy, you want to start a new riddle?
Tim Allerton Charles Arrundell Rhoda Dawes
Are they all involved in minor crimes, but suspected of murder?
If I am wrong I am sorry but I honestly thought I read Rhoda was left with Stockings while Poirot talks to Anne