In Sarah MacLean's debut novel, Calpurnia Hartwell has always adhered to society's strict rules, which has left her on the fringes and deeply unsatisfied. Deciding to change her life, Callie embarks on a series of rule-breaking escapades, from gambling at a men's club to firing a pistol. Her adventures lead her to Gabriel St. John, the Marquess of Ralston, known for his charming, scandalous reputation. As Callie dives deeper into this thrilling new world, she risks alienating her family and losing her old life. She faces the ultimate challenge when she starts to fall in love, breaking the most crucial rule for a pleasure-seeker.