When Thomas Hauser was selected for induction into the International Boxing Hall of Fame in 2019, his relationship with Muhammad Ali was widely cited. But Ali was just one of the many fighters who have shared momentous times with Hauser. For decades, elite fighters like Evander Holyfield, Manny Pacquiao, Gennady Golovkin, and Canelo Álvarez have welcomed him into their dressing room to record their journey on fight night.Drawn from his critically-acclaimed yearly collections of boxing essays, In the Inner Sanctum celebrates these most dramatic hours in fighters’ lives—chronicling the very moment when a fighter’s physical well-being and financial future are on the line, when the fighter is most alive and most at risk.