Kathy's house was on a corner, high up a hill. It had been two houses once, so it had two front doors. I rang the bell on Mardo's side, but nobody came. then I went to the other door. Nobody answered.
While I was waiting, a grey Dodge car went quickly round the corner and smart girl in blue looked up at me for a second. I didn't see the other person in the car. I didn't look very hard. I didn't know it was important.
I opened the door with Kathy's key, and walked in to a living-room with just enough furniture in it. I walked through the house until I found the door to the other side. I unlocked and went through.