When adventurous Ebbin goes missing at the front in 1916, Angus defies his pacifist upbringing to join the war and search for his beloved brother-in-law. With his navigation experience, Angus is assured a position as a cartographer in London. But upon arriving overseas he is instead sent directly into the trenches, where he experiences the visceral shock of battle. Meanwhile, at home, his perceptive son Simon Peter must navigate escalating hostility in a Nova Scotia fishing village torn by grief and a rising suspicion of anyone expressing less than patriotic enthusiasm for the war.