The Powers are no ordinary family - they're pooper-soured! That is, super-powered. All except Suzie. Poor ordinary Suzie has no powers at all. Or does she? Meet the not-so-super superheroes who seem to attract trouble wherever they go.
Daisy Wells and Hazel Wong have returned to Deepdean for a new school term, but nothing is the same. There's a new Head Girl, Elizabeth Hurst, and a team of Prefects - and these bullying Big Girls are certainly not good eggs. Then, after the fireworks display on Bonfire Night, Elizabeth is found - murdered.
When Daisy Wells and Hazel Wong set up their very own secret detective agency at Deepdean School for Girls, they struggle to find any truly exciting mysteries to investigate. (Unless you count the case of Lavinia's missing tie. Which they don't.) Then Hazel discovers the Science Mistress, Miss Bell, lying dead in the Gym.