HELP!! I’m losing my mind. I can’t remember this author’s name.

About 20ish years ago I was obsessed with this author that wrote some historical mystery/thrillers with a slightly religious undertone to them. There was a three part series he wrote I believe and each book was a different color. Red, black and green maybe? I’ve been combing google because I’m dying to remember this authors name. I know this is all kind of vague but my memory sucks. My daughter and I read books together and I really wanted to read these with her but I can’t remember his name!!! He co-authored with a big name at one point but I wasn’t a big fan of that particular book. Is any of this ringing a bell?? I’m losing sleep over this…