A World War I canine hero saves the day in this action-packed, heartwarming story. When the British military asks for dogs to help the war effort, Darling's family reluctantly sends her to be trained as a mercy dog. Through gunfire and poisonous gases, it's Darling's job to find injured soldiers on the battlefield and fetch help from the medics. After saving the lives of numerous soldiers, Darling suddenly finds herself in need of rescue...