Basil in the Wild West by Eve Titus, 1990.
This book picks up right after the previous book in the Basil of Baker Street Series, Basil in Mexico.
After leaving Mexico, Basil and his best friend Dr. Dawson journey north into the western territories of the United States. There, some friends of their ask them to investigate a smuggling operation. Mice have been illegally bringing Mexican antiquities across the border.
Basil realizes that the smugglers have been smuggling the antiquities in the open, pretending that they are ordinary replicas, the kind that tourists often buy. Because the border guards aren’t experts in antiquities, they haven’t been able to tell the difference between harmless souvenir replicas and the real thing.
When they catch one of these smugglers, they learn that the mastermind behind the scheme is a mouse call J.J. in a town called Moriarty in New Mexico (the name of the town irritates Basil). They go to the town with the help of some friendly horses and confront J.J.. At first, they think it won’t be too difficult because, although J.J.’s house is well-guarded, he is confined to a wheel chair because of an accident. However, the wheel chair is an act, and J.J. is no ordinary mouse.
Although J.J. escapes, Basil and Dr. Dawson decide that the smuggling ring has been defeated and it’s alright to continue their sight-seeing. However, their adventures are not over!
Basil and Dawson want to see the Grand Canyon, but it turns out that the hotel where they are staying is being terrorized by a weird, glowing Thing. Nobody knows what it is, but guests think it could be some kind of ghost or monster, and many of them are too afraid to stay. The owners of the hotel ask Basil to discover what the Thing is and stop whoever may be behind it before their hotel is ruined!
This book is really two stories in one, and neither has any direct bearing on the other. In that way, it’s kind of disjointed.