I've now read the first three Wells and Wong mysteries (titles in the USA are different from the UK ones). They are a worthy successor in the genre of school-kid cozy mysteries. Daisy Wells and Hazel Wong attend a boarding school in England in the mid-1930s. Hazel is from Hong Kong; her father attended Eton. Both girls are twelve at the beginning of the series. Hazel, trained to think logically by her father, writes the stories and acts as Watson but does at least half the detecting. While there are many stereotypical 1930s characters, the main characters have realistic reactions to the crimes they investigate, reactions which continue into the next books and relate to their development as individuals.