Innocence tells the story of children who resisted to be enlisted but capitulated. Their stories were never told as they died during their service. Through a narration based on their haunting diaries, the film depicts their inner turmoil. It interweaves first-hand military images, key moments from childhood until enlistment and home videos of the deceased soldiers whose stories are silenced and seen as a national threat.

It's 1918, the height of United States involvement in World War I - Liberty Bonds are sold, German immigrants are suspected as traitors or saboteurs, young men everywhere succumb to the patriotism and propaganda and enlist. In a small Texas town, Horace Robedaux feels the pressure - he doesn't want to leave his young wife Elizabeth and their young child Jenny - but Elizabeth's can't-do-anything-right little brother is constantly talking about the war, and Elizabeth's stern father, who opposed the marriage initially, now has plans to take care of his daughter and the child so Horace can fight for his country. However, the influenza epidemic sweeping the town (and the nation) may change everyone's plans.

Montreal, 1940. The Second World War is raging in Europe. Pierre Sauvageau, 22, would like to enlist, but he has to take care of his twin sister, crippled from birth. This proximity awakens the sensuality of Berthe who tries to seduce her brother. Pierre rejects her advances, but when he falls in love with Marguerite, his best friend's girlfriend, he is haunted by the fantasy of his sister.