A Fast-Paced Ride through a World of Privilege and Glamour Inspired by Real Life and Equestrian Experiences of Mayor’s Daughter In Georgina Bloomberg’s debut novel, The A Circuit (May 2011), readers fell in love with three spunky teenage elite riders competing in the privileged equestrian world: Zara, the wild child of a famous rock star, Kate, a working student serious about riding, and Tommi, a billionaire heiress. The series continued with My Favorite Mistake (February 2012) where we saw the characters bring more drama and controversy to the A Circuit than ever before.     Now, in Off Course (Bloomsbury; November 13, 2012; original paperback; $9.99), the highly anticipated third novel in Bloomberg’s teen book series co-written with Catherine Hapka, we watch Zara, Kate and Tommi continue their struggle to strike a balance between grueling competition schedules and barn responsibilities at Pelham Lane Stables with their desire to lead social lives like normal teenagers.