Beginning in August 1944, Szpilman was hiding out in an abandoned building at Aleje Niepodległości Street 223. In November, he was discovered there by the German officer, Captain Wilm Hosenfeld. To Szpilman's surprise, the officer did not arrest or kill him; after discovering that the emaciated Szpilman was a pianist, Hosenfeld asked him to play something on the piano that was on the ground floor. Szpilman played Chopin's Nocturne No. 20 in C♯ minor.[8] After that, the officer brought him bread and jam on numerous occasions. He also offered Szpilman one of his coats to keep warm in the freezing temperatures. Szpilman did not know the name of the German officer until 1951. Despite the efforts of Szpilman and the Poles to rescue him, Hosenfeld died in a Soviet prisoner of war camp in 1952.