Rivers Of London

This is a more complex story than you'd normally find in comics, but it manages to pull it off well. It's concerned with the Russian mob's involvement with magic, with some of the (non-essential) dialogue written in Russian without the usual translation. It also brings in several of the characters from the novel series in a procedural that involves quite a lot of double-crossing on the part of the various villains. It probably doesn't make a lot of sense on its own, and requires knowledge of the novels, but it does fit beautifully in with them, providing further insight into one of the characters in particular. Given the complexity of the plot, it also rewards careful reading, but the sophistication is part of the strength.