Where Does the Teacher Live?: Puffin Easy-To-Read Level 2

My daughters, ages 7 and nearly 6, are entranced by the storyline of this book. A couple of second grade classmates decide to find out where their teacher goes after school. They shadow her for several days, trying to figure out where she lives. My girls--like some of the characters in the book--had never thought to wonder if teachers had a life outside of school, and they find the story quite suspenseful. There is just enough text, but not too much, for someone who reads on about a 1-2 grade level.