A young doctor comes to Persia to visit his friend and add to his medical experience. The friend persuades him to postpone his professional care for a while and have fun. The doctor is brought to the old tower, which contains young slaves, intended for sale. Examining the “goods”, the doctor draws attention to one of the slaves – Bianca. She, in turn, rushes to him with a cry: “Brother! Do you remember me?” The doctor is astonished. He buys a slave. As soon as she appears at home, a miracle happens: barely penetrating sprouts on flower beds blossom lushly.