Despite being extremely close to his father, Matthew knew very little about his paternal grandparents, James Joseph Broderick and Mary Martindale, both of whom had passed away by the time Matthew was born. He had heard rumours that his grandfather was a World War I hero, but were they true? Of his grandmother, Mary Martindale, the family agreed on one thing - she was a complete mystery.
Following in his grandfather's footsteps, Matthew heads to the battlefields of northern France, where he uncovers the extent of his grandfather's bravery. He is amazed to discover that his grandfather took part in the Meuse-Argonne offensive, which would prove to be the largest and deadliest battle that the American Expeditionary Force was involved in during World War I.
Back in Connecticut, Matthew starts to unearth the story of his grandmother Mary Martindale's tough childhood. Digging deeper into the Martindale history, he stumbles upon another military hero, his three times great-grandfather Robert Martindale, union soldier in the American Civil War. Intent on honouring Robert's bravery, Matthew sets out to solve a 150-year old mystery; what was Robert's fate in the war, and where is he buried?