Bar-20 days a Hopalong Cassidy novel

There's always something happening with the Bar-20 gang. For instance, there's the matter of the ghost of San Miguel Canyon who everyone agrees is the ghost of Carlos Martinez who was murdered long ago. But why does he show himself only on Friday nights -- and only to a Mexican? Hopalong Cassidy suspects there's a devious and practical reason. Then there's the day Hopalong rides into Rawhide and learns about its self-appointed ruler who is though...