This document includes 44 comprehension questions arranged by chapter for the first book in the Field Trip Mystery series by Steve Brezenoff entitled The Zoo with the Empty Cage. The questions are designed to guide the reading of an above averaged Elementary student or a struggling Middle school student. Some of the questions are basic recall of significant events, but many of the questions address skills like comparing and contrasting, describing, or predicting. Most of the questions include multiple parts and are designed to be answered in complete sentences. There is a complete typed answer key at the end of the document.