Book Three: Doc and Johnny's Old West Mysteries. Johnny uncovers a mystery involving the disappearance of a Pony Express rider some twenty years before. He smells foul play and investigates with his new 15 year old friend, Jericho. He helped nurse Jerry back to health after he had been attacked and badly hurt by a coyote while handling the horses on a cattle drive. They explore one of the original Pony Express Station Buildings, spend a night in a...