"The Miracle of the Cards" is based on the true story of Marion Shergold and her son, Craig, an eight-year-old English boy who had a brain tumor. Several events convinced Marion that God was leading her to a cure for Craig and that the get-well cards he was receiving had the power to keep him alive, so she launched a worldwide campaign to break the Guinness record for receiving the most get-well cards. At the time, the world record seemed an impossible 1,000,265, but Craig received over 350 million cards from all over the world. Against the advice of her doctors, Marion followed one of those cards to America for Craig's miraculous cure.

O diagnóstico de um tumor no cérebro muda a vida de Craig Shergold, um garoto de 8 anos que, apesar das previsões pessimistas dos médicos, ganha forças para realizar o sonho de conquistar um recorde: receber o maior número de cartões. Em meio a tantas preces, Craig encontra uma mensagem especial.