The Constantine film came out in 2005. I saw it last weekend being something on Amazon Prime that neither of us had watched before. I've never read the graphic novels, but had watched and enjoyed
the TV series (it was my favourite series seen in 2018).
The film was enjoyable too. Despite being a big fan of Ryan in the TV series, I also liked Reeves' turn in the role. It had a decent atmosphere, the plot was OK and the characters worked. I felt, between the two (series and film), I had some grasp of what the graphic novels might be like. One day I might get them and find out.
The Silkworm is the second Galbraith (Rowling) novel in the Strike detective series. I suspect you can read it without reading the
first book and not be spoilered for the murder (but you will be spoilered for the characters). Like the first one, I enjoyed it and thought it an interesting and gripping mystery. I did guess the murderer this time, but still liked the lead-up to it. Also, I'm enjoying how Robin is developing.