Reading progress update: I've read 23%.

The Pale Horse - Agatha Christie

I am a little bit confused about what exactly is going on - i.e. where is this plot going?

 

Also, who are all of these characters? I mean, I get Ariadne, and Mark, and even like that we meet Rhoda and Major (now Colonel) Despard (from Cards on the Table) again, but what is it with the introduction of all of these other characters? 

 

I may need to make a list. :O