Murder Most Unladylike by Robin Stevens

Deepdean School for Girls, 1934. When Daisy Wells and Hazel Wong set up their very own deadly secret detective agency, they struggle to find any truly exciting mysteries to investigate. (Unless you count the case of Lavinia's missing tie. Which they don't, really.)

But then Hazel discovers the Science Mistress, Miss Bell, lying dead in the Gym. She thinks it must all have been a terrible accident - but when she and Daisy return five minutes later, the body has disappeared. Now the girls know a murder must have taken place . . . and there's more than one person at Deepdean with a motive.

Now Hazel and Daisy not only have a murder to solve: they have to prove a murder happened in the first place. Determined to get to the bottom of the crime before the killer strikes again (and before the police can get there first, naturally), Hazel and Daisy must hunt for evidence, spy on their suspects and use all the cunning, scheming and intuition they can muster. But will they succeed? And can their friendship stand the test?

Set in the 30's and an all-girls boarding school, cut off from the rest of the world, Daisy and Hazel have a murder to solve. Things are not easy as they first have to find the body! Written from Hazel's perspective from her detective notebook, we follow their adventures as they to determine who might have wanted to hurt their science mistress. 

What I really loved was the lovely portrayal of their friendship, especially the balance between them, as Daisy is the leader and Hazel is the quiet new girl. While Daisy might be the the brains in the operation but as she realises she's been underestimating Hazel, Hazel gets her chance to shine. And as the narrator, Hazel is the more emotional one, as she is the one who discovered the body, the one who really takes to heart the possibility of a killer living among them. 

This was such a great mystery, I had many guesses but didn't see the truth coming! The mix of adventure, mystery and friendship was really cool and very fun to read. 

Published 5th June 2014 by Corgi.