In late April or early May 1944 (25 April, according to Bishop László Ravasz of the Reformed Church in Hungary), two officers from the Gestapo (the German secret police) arrived at the mission home to arrest Haining. They searched her office and bedroom, and gave her 15 minutes to pack. According to one colleague's diary entry on 30 April 1944, Haining was "now in the cellars of Police HQ. I asked consulate why and was told that a charwoman denounced her of having a secret radio receiver". She was at first held in a house used by the Gestapo in the Buda Hills, before being moved to Fő utca ("Main Street") prison. Her friends took her weekly parcels of food and clean underwear. According to a fellow prisoner, Miss Francis W. Lee, as told by David McDougall in 1949 (Lee survived the war and moved to New Zealand), Haining was questioned twice and had the following charges put to her: