The Dastardly Murder of Dirty Pete by Eth Clifford, 1981.
Mary Rose Onetree is starting to think that her father really likes her younger sister, Jo-Beth, better than her. Her father seems to like Jo-Beth’s dramatic flights of fancy, and he likes to say things to make her laugh. Mary Rose, on the other hand, is the sensible, practical one, and her father keeps getting irritated with her advice, especially when she frequently turns out to be right.
On their latest car trip, going to visit their Grandmother Onetree on the West Coast, Mary Rose warns her father not to leave the main road (something that he loves to do because he’s a newspaper man and can’t help being curious), and he does so anyway. Mary Rose warns him that she can’t even find this little side road on the map, but when he sees the sign that says, “Inn of the Whispering Ghost on Skull Valley Road. Two miles right at the first crossroad ahead,” nothing can stop him from going further to investigate.
Harry Onetree and the girls find a ghost town with a hotel, an opera house, and several other buildings. Although Harry only means to look around for a little while, he forgets to set his parking brake (something else Mary Rose warns him about, which he ignores), and their car rolls backward into a ditch. Since it’s getting dark, they’re stranded in the ghost town for the night. But, they’re not alone there.
They find some food in the hotel’s kitchen, and one of the chairs is warm, as if someone had just been sitting there. In an old newspaper at the hotel, they read about Sorehead Jones, who murdered the hotel owner, Dirty Pete, back in 1905 in order to get his hidden treasure of gold. But, Dirty Pete wounded Sorehead before his death, and Sorehead died shortly after, swearing that he’d seen the ghost of Dirty Pete. Supposedly, Sorehead is also a ghost who wanders through the town whispering, “Where is the gold?”
Could the ghost be the mysterious person in the hotel? But, why would a ghost need food? Then, Harry realizes something about the town that changes everything, but they still need to confront the whispering ghost before they can leave.
The solution to this one concerns the difference between fantasy and reality, and the lengths that someone might go to in order to make someone else happy. Mary Rose also comes to realize how much her father really loves her.
This is part of the Mary Rose and Jo-Beth Mysteries series. It is available to borrow and read for free online through Internet Archive.
Scared Silly by Eth Clifford, 1988.
While the Onetree family is visiting the museum, a pair of shoes that once belonged to a Chinese emperor disappears. Like the two Onetree sisters, Gus considers himself the sensible brother and doesn’t take Razendale, the dreamier sibling, very seriously. He thinks Razendale ran off with the shoes as a prank. But, Erik, who seems more sensible than either of his uncles, says that they can’t just accuse him without proof. Gus provides them with an invention that could settle the whole matter, but that depends on whether or not they can trust Gus.
Just Tell Me When We’re Dead! by Eth Clifford, 1983.
The first place he goes is to an island in the middle of the lake near his house. The island has campgrounds and an amusement park, which is now closed for the season. Mary Rose and Jo-Beth, realizing where Jeff has gone, follow him there. But, the children are not alone on the island. When Jeff is captured by two criminals who are looking for loot that they stashed on the island years before, he has to keep his wits about him to find a way to summon help. Meanwhile, Mary Rose and Jo-Beth have no idea what they’ve just walked into.

The Ghost that Came Alive by Vic Crume, 1975.
They tell the kids that the house is supposed to be haunted and people can often hear the ghost of Andrea Cliff calling out in the night. The kids soon hear this spooky voice themselves, calling for help. Trapped in the house with the ghost and unfriendly people, the Blairs decide that they have to figure out what’s really going on, but the danger is worse than they know, and Jenny’s premonition of doom is getting stronger all the time . .
The Mystery in Dracula’s Castle by Vic Crume, 1973.
Alfie is an aspiring film maker. Specifically, he wants to make horror movies, and he talks his younger brother into playing the part of Dracula in his latest Super 8 film. Leonard is only a reluctant vampire because he doesn’t like horror movies. He really wants to be a detective, like Sherlock Holmes. Back home, he and his brother saw police investigating the scene of a robbery at a jewelry store, and he’s decided that he wants to investigate crimes like that. Soon after they arrive at the beach house, Leonard adopts a stray dog and names him Watson so that he can be his sidekick.
The Case of the Haunted Health Club by Carol Farley, 1991.
Flee Jay thinks this is spooky, but Clarice doesn’t believe in spirits. In order to investigate further, the two girls accept part time jobs helping the fortune teller and her nephew to clean up the building so they can move in new exercise equipment. “The spirits” continue sending warnings in the form of red dye in the Jacuzzi and threatening messages. Clever Clarice uses logic to point out how most of these things were accomplished but is surprised when Flee Jay reveals something that she overlooked.


