How did one man dis­cov­er the the­o­ry of rel­a­tiv­i­ty on his own? Maybe he didn’t. A fas­ci­nat­ing slice of for­got­ten his­to­ry that illu­mi­nates how Ein­stein kept his bril­liant wife in the shad­ows, bring­ing to life a woman who was fierce, fero­cious­ly bril­liant, and fun­da­men­tal­ly deter­mined to leave a lega­cy of her own.