Having read the books in order, I have just finished reading Troubled Blood. Compared to the previous Lethal White which I found rather boring in plot, Troubled Blood kept me on my toes and up well into the night reading with excitement for every single development and clue found. JK Rowling is a writing genius and I enjoyed the character building, the unforseen twists and turns, the suspense and, most of all, the unexpected real killer. It is by far my favorite of the Strike novels so far, followed by Silkworm and Cuckoo's calling. 10/10 recommend!