Lucas is a fighter in the Polish Resistance Movement during World War II. But when he wakes up in the trenches after a long night of being shelled, all he has left is a torn photograph of a family.

On December 20, Lucas is left at the train platform of a bombed-out Polish village. Nothing is familiar, though his buddies assure him that this was his home town. A young woman recognizes the people in his photograph, but his hope is short-lived when he finds out they were some of the first casualties of the war.

As he leaves the village, he comes upon two children; a brother and a sister, both on the verge of starvation. He wants to help them, but he has nothing to give: not a blanket, nor a scrap of food.

On the train, he notices the little girl is carrying her own torn photograph. When he asks to see it, he realizes that it is the second half of his own picture. With a full heart, he recognizes the young boy in his photo as the little boy sitting across from him. In the second half of the photo he sees himself in his uniform holding hands with the young girl. The children are his family: his own brother and sister.

One more face in the picture draws his attention. It is the girl who helped him in the village—she is his sister, killed along with his parents, but who has returned as an angel to make sure the little family was reunited and safe.