An all-female detective agency righting wrongs at the end of the nineteenth century; infiltrating a scandalous upper class world straight out of Bridgerton and using their wit and bravery to unmask a villain.

Felicity Vane may be a mathematical genius, but getting her family to understand her academic ambition is proving difficult. As her first social season is fast approaching, it might be time to take matters into her own hands. Infiltrating the glamorous world of The Lucky Penny and winning her university fees over a game of cards could be the perfect plan. if only it weren't for the interference of Ash, the piratical and frustratingly handsome owner who accuses her of cheating. Now, Felicity finds herself thrown into the latest investigation of the Aviary - a fearless, covert group of female investigators - and caught up in a dangerous game of cat and mouse with the worst villain they have faced yet. When the stakes are this high Felicity can't afford to lose, but as she and Ash get drawn deeper into a world of criminal conspiracies is she also gambling with her heart?