A few posts ago I mentioned a new series by Diane Capri which pays homage to a character from Lee Child's very successful thriller series, in her Hunt for Jack Reacher series.
I recently listened to an audio book which payed homage to the plot of the classic mystery by Josephine Tey: Brat Farrar.
Jenny Valentine's The Double Life of Cassiel Roadnight is a teenage/young adult novel which is set in Hay-on-Wye.
I haven't read Brat Farrar, though I have a copy - not this one with the stunning Mark Greenstreet on the cover - but I did watch the BBC TV series when it was shown many many moons ago and loved it. It's not available to buy but you can watch a patchy version on You Tube.