Deletion of Plot devices in Agatha Christie's novels

Comment: largely per nom. I'd contend that this is an example of a well-intentioned attempt at synthesising Christie's works in a manner which |is generally not a good thing to do. It's also entirely unsourced - by which I mean that the argument that these are common plot points is unsourced, not that these plot points actually occur
Stance: delete
Cited policy: Wikipedia:No original research (WP:OR)