Not entirely. 'The Keepers' likely takes inspiration from real incidents but incorporates fictional aspects to make the story more engaging and compelling.
Yes, it could be. There are many book series where 'Finders Keepers' might be the first novel. However, without more context about the specific series, it's hard to be certain.
I'm not sure exactly as I haven't read it in detail. But generally, it might be about a group of people who are the keepers of a house. Maybe they have some special duties or secrets related to the house.