This is book one of the Ulysses Moore series.
When Julia and Jason move into a new home, they notice the house has many rooms and mysteries. The kind of mysteries like a chair moving when you are not looking. While playing, Jason falls from a cliff and finds a mysterious box in a little hole in the rock face. In this box is a coded message that sends the children on an adventure trying to figure out what it means.
Rating: 8/10 – I did enjoy this book quite a bit but there was a lot of problem solving and not much action.