"There was a full-sized seated skeleton in front of them on the steps. "The Walking Skeleton!" Benny said. Henry chuckled. "No, I guess you'd have to call it the Sitting Skeleton. It's just sitting there as if it stopped to take a rest." "I'm not afraid of Halloween tricks even when it's not Halloween." Benny scurried past the skeleton. Henry looked very serious. "Now I know someone is trying to scare us away from Skeleton Point again," he said. "You're probably right, Henry," said Jessie. "But who could it be?" "William Mason and Hilda Stone," said Benny, almost immediately. "They're mean to us, and they don't want us around." "You're right, Benny. Remember that man in town said William Mason wanted to buy Skeleton Point for himself? Maybe he's mad at Charlotte for buying it first." Jessie looked thoughtful. "What about Greeny?" she asked. "We know he doesn't want us around, either--and we know he's taking things from the house. Maybe he wants to scare us away so we won't figure out what he's up to. We should still keep an eye on him." Henry agreed. "In fact, we should keep an eye on all of them." When they returned to the house, the Aldens found that William had joined Hilda outside. Jessie waved. "Hi!" she called out, as if she had come straight from her errand across the lake. "Sorry we took so long. The hardware store was out of those light switches." Hilda and William kept working. It seemed neither of them wanted to say anything. Finally Hilda spoke up. "Oh, it turns out we don't need them after all." William pushed back the brim of his red hat and checked his watch. "Half the day's gone. I don't see much use for you kids sticking around here. Hilda and I are doing some technical work Charlotte asked us to do--not something suitable for children." "We know how to measure, too" Benny said. "I learned in kindergarten." Hilda hesitated. "What we're doing is a little more complicated than what you do in school. Now, why don't you children go for a bike ride. Or a swim," she suggested before going into the house. Henry turned to William. "We already went for a swim," he said. "An unplanned one." William didn't say anything about untying the Alden's boat, but he looked away and cleared his throat. "Well, then, go for a planned one this afternoon. Take tomorrow off, too. Everything's under control here." Before William turned to go into the house, the Aldens looked down. Just as they suspected, William was wearing heavy work boots that left deep prints just like the ones near the statue. The Mystery at Skeleton Point"