The Lords of Time | 
pickOur detective this time is investigating a serial killer that is recreating murders from a best selling book. I generally don't like "books within books", so the fact that every other chapter was a chapter of the fictional book made me struggle at the beginning. I thought that presenting this fictional book as something all the characters love was the author shooting herself on the foot, because it was boring me to death. ⬇️
nanuska_153 Then both stories picked up and I have to admit I got hooked on both and this ended up being my favourite book of the trilogy. In the acknowledgements I saw that this is actually a crossover with a historical saga written by the author years ago, which I thought it was a pretty cool idea as well as very clever marketing that possibly worked with me 1y
