The Mystery of Lost Creek — Dorothy Baughman

Jon and Marty James love to visit their Aunt Bet every summer on her ranch in New Mexico. This time they get to stay all summer IF they take their little sister, Pitty. Trouble starts as soon as the three children arrive with the disappearance of the cattle. If Aunt Bet can't sell the cattle, she can't make her ranch mortgage.

Buford Hayes, a local businessman, makes Aunt Bet several offers on the ranch but she refuses. Soon it becomes apparent that someone is trying to run Aunt Bet off her ranch when the barn burns down. Buford is the prime suspect. Then Pitty gets lost. To top it all off, the children visit the old haunted mine on the ranch. They hadn't believed the stories of the Wailing Prospector until he chased them out of the mine. But can the children solve the mystery and catch the person trying to ruin Aunt Bet? Can they save the ranch they all love so much?