When Daisy Wells and Hazel Wong set up a secret detective agency at Deepdean School for Girls, they can't find a truly exciting mystery to investigate. (Unless you count The Case of Lavinia's Missing Tie. Which they don't.) Then Hazel discovers the body of the Science Mistress, Miss Bell -- but when she and Daisy return five minutes later, the body has disappeared. Now the girls have to solve a murder, and prove a murder happened in the first place.

First published by Corgi Books in 2014.