2C
   Stepping Stones (Mystery): The Case of the Elevator Duck
   Polly Berrien Berends
   Random House
   Paperback
   64
   5000
Gilbert는 탐정이 되고 싶은 소년입니다. 어느 날, 사람들이 다 내린 엘리베이터 안에서 거위 한 마리를 발견합니다. 아파트 관리인의 눈을 피해 이 거위의 주인을 찾아줄 수 있을까요?