Dexter told Delilah that December was the absolute best month. Nearly every day the doorbell rang. Either people were coming to visit, or packages were being delivered. Someone named Amazon was very generous and sent many, many packages. It was so much fun even when they weren't for Dexter, he had another box to play with.
Dexter told Delilah that the doorbell ring is the best sound in the world. He always races to the door to see what great thing is on the other side.
Delilah told Dexter that he is such a risk taker. It could be "anyone" or "anything" on the other side of that door. She told him that when the doorbell rings, he should follow her lead and dash to the basement and stay there until the coast is clear.