The true and incredibly moving story of Tom and Nicola Ray (Tom Riley, Joanne Froggatt), whose love is tested to the limit when their perfect life falls apart. When Tom puts his small daughter to bed one chilly December evening, he has everything he could ever want - the house of his dreams, the life of a writer, a beautiful wife and a second baby on the way. By the next morning, all of this is in jeopardy as Tom succumbs to the devastating illness that is sepsis.