I finally managed to finish a very detailed book, I bought and began reading, a few weeks ago - described as a 'novel' which detailed a series of three local murders, potentially more, in the village where I live. It all began, years before I relocated here, but the bodies were being found, and investigated, after I moved here. The author, claimed it was a novel, based on events, not naming actual people and places - but it went into great detail, about the police investigation, and all the names and places were the correct, in incredible detail, and verifiable ones, some known to me. Not until the epilogue, at the end, did it suggest the author was personally involved in the police investigation, and working with the key figure running it, at the time.
A friend, now in Canada, father's surname was mentioned in the book as a manager, and witness, so I had to email him and ask. He wasn't aware of him as a relative.
It all happened in the mid-70's, and yet the book, not published until a couple of years ago.