I think (Dr.) Eddie Henderson took care of Monk at some point. Maybe when he (Henderson) was a psych. resident at a hospital.
Balancing a career in psychiatry with his love of forward-thinking post-bop and fusion, trumpeter Eddie Henderson has cut a distinctive path in modern jazz.
You can read them independently, but I read them in order. I believe it helps especially to follow the St. Cyr "arc". OTOH, each one has a separate new storyline.
Hold it. There is a 7th one I didn't know had been released. The Day Ends At Dawn - apparently the last in the series. I'm getting it immediately. Love how he incorporates Buddy Bolden into the stories. St. Cyr is also a great detective character.