Twelve-year-old Teddy investigates when a popular Texas zoo's star attraction--Henry the hippopotamus--is murdered. Interest Level: 5-8 Reading Level: 5.6 ATOS Book Level: 5.6 AR Interest Level: MG AR Points: 10 AR Quiz: 137835EN Reading Counts Level: 5.4 Reading Counts Points: 15 Lexile Measure: 820 Iowa Children's Choice Award 2013 - 14. Teaching Books: https://school.teachingbooks.net/tb.cgi?tid=23848.