Gertrude, Gumshoe: Haunted Hotel - Gertrude in South Dakota, #2

"There's no such thing as ghosts! Right?" Gertrude thinks she's got a knack for proving that ghosts don't exist, but this time she's taking on a celebrity phantom: Seth Bullock. She and Calvin pack the cats into the camper and head to Deadwood, where she will attempt to prove herself right once again. But shortly after she gets there, a movie star drops dead, and she finds herself with two cases to solve.
Maybe the two cases are even connected? The mysterious green feathers she keeps finding everywhere seem to suggest that they might be. Is she getting a little sleuthing help from the great beyond?  The Gertrude, Gumshoe Books in Order:Book 1: Introducing Gertrude, GumshoeBook 2: Gertrude, Gumshoe: Murder at the Thrift StoreBook 3: Gertrude, Gumshoe and the VardSale VillainBook 4: Gertrude, Gumshoe: Slam Is MurderBook 5: Gertrude, Gumshoe: Gunslinger CityBook 6: Gertrude, Gumshoe and the Clearwater CurseGertrude in South Dakota Book 1: Gertrude, Gumshoe: S'more MurderGertrude in South Dakota Book 2: Gertrude, Gumshoe: Haunted HotelGertrude in South Dakota Book 3: Gertrude, Gumshoe: Cowboy ShootGertrude also makes an appearance in The Prima Donna.