Arsenic For Tea, Robin Stevens

Arsenic For Tea is a young adult novel by Robin Stevens. The scintillating second instalment to a series of murder mysteries, it follows Daisy Wells and Hazel Wong at Deepdean school for girls. Trouble's afoot when Daisy has a birthday party: the whole family, and of course, her best friend are invited, however, they are soon one guest short when someone had the party is murdered by poison. 

A Murder Most Unladylike series takes place at an unusually dangerous girl's school in which two junior detectives must unravel dangerous mysteries. Each of the 10 volumes tells an individual story and can be read as a standalone. 

Sherlock Holmes meets Harry Potter, each of the books contain short, accessible chapters as well as detailed illustrations, a fantastic stepping stone for young readers on their way to more advanced literature.