A four-book set by Jen Sincero, the author of bestsellers sold in a total of 7 million copies, designed to help readers change their lives. Each book contains self-work methods supported by the author’s personal experience, helping you raise your energy level, stay mindful, and maintain motivation even in the hardest times. The set includes the books “NI S’Y”, “NI NOI”, “NI TUPI” and “NI ZYA.”