Santiago was a Spanish man living in the heart of the country, in Madrid, in a neighborhood filled with villas. He lived in one of the larger villas with his daughter, Lotte, who was 4 years old and very energetic. His wife had died a year ago, which meant he didn't talk much to others.

It was Monday, 10:23 a.m., when Santiago went to the bakery to buy some rolls and something sweet...