Please help me find a series of books about...?

Question: Please help me find a series of books about!.!.!.!?

its about these 4 kids and i they always think there is a monster, like one book they are at camp and they think there is a lake monster, one book they think there teacher is a vampire, and they find all these clues that would make you think there assumption is true, but in the end it is still undetermined!.!.!. every book the tittle starts out the same!.!.!.but i can not remember the tittles!Www@QuestionHome@Com

Best Answer - Chosen by Asker:

That sounds like The Adventures of the Bailey School Kids series by Debbie DadeyWww@QuestionHome@Com

I've never read them, but maybe they're the Goosebumps series by RL Stein!?Www@QuestionHome@Com