This is a mystery series where 2 children from America move to England and, because of their ancestral relationship to James Watson, become involved in a group of people who investigate old files of Sherlock Holmes. In this book, the two main characters Xena and Xander work to solve a mystery of a missing painting. It has moments where it is clever and interesting but others where it’s a bit simple. Of course the audience is younger, so it should be. In all, a good book for 3-5 grades.