When Mary Godwin and Lady Ada Byron first meet, they don't exactly hit it off.

But with crime on the rise, the unlikely pair form a detective agency to hunt down clever criminals on the streets of London.

Their first case involves a stolen necklace, a false confession, and lots of suspicious suspects - but these are no match for Ada and Mary.

Filled with daring balloon chases, vile villains and two unforgettable heroines, The Case of the Missing Moonstone is the first in a thrilling new series; perfect for all aspiring sleuths.