I would rate this as a solid 3 stars.
It is kind of exactly what you would expect from the book description. A bit of mystery, a bit of kink.
It could have gone further, possibly, and had more to it, and the situation been explored and given more depth and grit, but for a kindle freebie, it was a decent quick read.
And I liked the chapter at the end from “Sir’s” PoV – it gave more depth to the whole story, it also made it more of a Romance Erotica as opposed to a straight out Erotica/Dark Erotica feel (although I am not necessarily sure it would be classed as Dark Erotica anyway). But I love a HEA/HFN
Amazon Uk Link: Eraser