I am addicted to the detective novels of Jeffrey Deaver. The detective, Lincoln Rhyme, is quadraplegic, so he sends his minions out to do his legwork, much as Nero Wolfe had his Archie Goodwin, but the brainwork is done by Lincoln Rhyme. These are the most intricately plotted stories that I have read. Start with the first one, Bone Collector, because that introduces all the characters.
I second Cole Parker's Lee Child recommendation for his Jack Reacher novels.
In the gay-story genre, Horatio Nimier's stories are well done. They are at GA.
Porterville at Nifty, which I recommended in First Alert, is now complete. The writing is so-so, but the plot is well constructed, with lots of twists.
The protagonists of the previous three recommendations aren't detectives, but they are solving mysteries worthy of detective novels.