Mary Cullen represented Ireland at 3000m and 5000m. During the course of a glittering career she won bronze at the 2009 European Indoor Championships. She also broke Sonia O' Sullivan's record over 3000m indoors, and still holds that record to this day. In 2019, whilst pregnant, Mary was diagnosed with Cancer. And so began the biggest battle of her life, far away from the track. This episode is heart-breaking, uplifting and inspiring, all in one!