The Black Dove: A Holmes on the Range Mystery (Holmes on the Range Mysteries)

Crime-solving cowboys Gus 'Old Red' and Otto 'Big Red' Amlingmeyer are wandering around San Francisco when they stumble onto another mystery to be solved: the death of their acquaintance, Dr. Chan. It turns out that no one wants this mystery solved, but that doesn't stop the brothers from riling up the locals with their heavy-handed investigations.