Nightshade - Michael Connelly

I've read all Michael Connelly's previous books and enjoyed them, but this one seems like it was written by someone else. The writing style is very flat, the characters are cardboard and the plot is very weak. To check that it wasn't just my opinion, I looked at reviews on Goodreads and found many others with similar opinions.

I think some authors are expected to churn out books regularly and may pay others to do the work for them.