Still Writing And Mousetraps

I'm 2/3 done with my novel and not quite half way through the month. That feels great. I like the story. It's cute and quite a bit younger than what I have been writing. My problem is the ending. I'm catching the bad guy but I'm not sure what to do with him once I have him caught and then there is the whole this-story-is-now-officially-over part which just doesn't want to happen at all. Personally, I think my characters are having way to much fun in the dreamworld to come home and live in reality. I have a boy who has really great friends but he suddenly doesn't care if he ever sees them again if he can just build the world's best tree house in the most awesome trees anywhere. What is it with characters that when you put them on the page they actually think they can have lives of their own? Whatever. I'm including another excerpt just so you stay interested. Hope you enjoy.

Gary sat thinking and watching Herbert who had finally sat down in the chair he'd been jumping on. "Maybe we can build the world's biggest mousetrap," he said thoughtfully.
Sammy smiled. "We could," he said. "How would you build it if you were going to build a mousetrap to catch a Dreamstealer?"
Gary started smiling. "Do we build from the trap back or from the trigger forward," he asked.
"From the trap back," Sammy said. "We’d need a basket or something like that to drop over the Dreamstealer."
Gary nodded. "It would have to be strong so he couldn't break out of it."
"It would have to be built especially for trapping a Dreamstealer and it would have to be made of something that stopped imagination once you were inside so you couldn't imagine your way out of it."
"Right," Gary agreed. "What do we call it?"
Sammy thought of Mr. Tillden at his school in his world. He was constantly asking if they were a bunch of blank slates when they couldn't think of anything to write in their creative writing classes. "Lets call it blank slate stuff," he said.
Gary nodded. "That’s good," he said. "So the trap will be made of blank slate stuff. It has to be big enough to hold the Dreamstealer."
"I think the blank slate stuff will get bigger and smaller by itself so that it fits whatever is in it," Sammy said.
"That’s good," Gary said. "That's really good. You’ve done this before."
Sammy nodded. He pictured a big piece of paper in his mind with pencils and crayons to draw with. "Oh perfect," Gary said when they appeared on the table. He picked up a pencil and started to sketch a cage at one end.

Remember the game Mousetrap? That's what I'm envisioning. We'll see how far I get with it but for now it's a way to fill the paper. Ta.