M.C. Detective Agency: Files 1 & 2 

This multi-file series envelops a cleverly concealed chemistry curriculum with the stories of twins, Poppi and Ray, who solve mysteries using chemistry. These sibling sleuths have many adventures, including traveling back in time to rescue the Radium Girls, attending a modern day rock concert to save a vanishing Van Gogh, and swimming in a bottle of Chanel No. 5 to find the hiding aldehydes.