What would you title a book with this synopsis? I got the storyline and everything, I just can't come up with a title. Please help.
One day while hanging out at the park, a group of friends find a cabin. They find an old book inside and read the first couple of pages. When they started to hear things, they quickly left. That's when things start to go wrong. The next day, two people are reported missing. They have nothing in common with each other except for one thing: one yellow balloon was found at the last place they were seen. As time goes on, more and more people start to disappear. They friends thought nothing of it until one of their own, Sarah, goes missing. As time goes on, they stop looking for everyone. The friends then decide to look for Sarah themselves. They track her phone to it's last location, a clearing in the woods. But what was in the clearing that surprised them: a giant castle. As they navigate through the castle, they figure out years old mysteries, solve riddles and find out a horrifying truth. Oh, and one more thing. The castle is full of clowns.