No - not real murder mysteries!
I just joined a RootsWeb list for fans of mystery novels and someone shared
this website:
http://www.rootsweb.com/~mahampsh/reading.html
It's a list of mysteries with a genealogical theme - all by authors no one has
ever heard of, so I don't vouch for their quality!
However, I thought you would be amused to know that one of them apparently has
a detective named Sinclair:
"Killing Cousins: a Mort Sinclair Mystery" by Gene Stratton
Diane Hettrick, Seattle, dhettrick@earthlink.net