Stanley, Charlotte, Gertie, and Felix are just your typical twelve-year-old kids. They love to hang out after school...they love burgers and milkshakes...and they love math. And if there's one thing they love even more than math, it's solving mysteries! Thankfully, their hometown of Ravensburg, New York has plenty of mystery, and quite a few secrets. Books 1-5 Like new, smoke free home Paperback