I think you are more interested in reading about the book and author then many. I am the complete opposite, and prefer to know nothing about the author other than what they wrote.

As for general knowledge of Christe, I expect most people to have heard of her, and perhaps seen an adaption of some of her works, but that does not translate into having read all about all of them. As OP says, it would be fine having more information at the end rather than the front. For every reader is will be their first time once, and they would probably prefer to not be spoiled that time.