The 39 Clues: The Viper's Nest 基本信息 Author：Peter Lerangis ISBN13:9780545341363 Format:Paperback Book Pages:192 pages Grades:5 - 7 Lexile® Measure:590L Guided Reading Level:U DRA Level:50 ACR Level:4.1 内容简介 It's no longer a game. The body count is rising. Shaken by recent events, Amy and Dan flee to a distant land and trace the footsteps of their most formidable ancestor yet: a military leader of mythic proportions.