He leisurely strolls past the upstairs neighbors’ doorbell camera. He wears black Nikes, shorts and a backpack. Just before he disappears from view, his hand reaches for Carolien’s doorbell. It is then 3 a.m. on Tuesday, August 20. Exactly a month later it happened again, this time at 4:15 am. Same man, same shoes. This time with a thick sweater and long pants. You see him walk past the camera, after which he stops at Carolien’s door.