Germany, 1945. Year Zero. The war is at an end. When Ireland's ambassador to the Third Reich finally leaves the war-torn country, Garda detective Stefan Gillespie makes his way home under the watchful eye of British Intelligence, who are searching for some of the Irish citizens Ireland doesn't want back. The usual dirty business. But suddenly Stefan is drawn into a murder inquiry.

Unexpectedly arriving in a town he knew in his youth, on visits to his German relatives, Stefan feels compelled to help his cousin Annaliese and her hostile daughter Krista. Maybe it's nostalgia for first love, or for a time of peace, or maybe he just wants to do something that feels clean. But the past is a dangerous place to return to...