the triangle secret Cole, David 1957- creator author. O'Toole, Shannon illustrator. Liu, Yongjun translator. text Children's stories cc 2022 Di 1 ban monographic chi eng

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202 pages : illustrations ; 21 cm "When FBI Special Agent Carlson is kidnapped while investigating the plane crash of Willard Howell, an eccentric billionaire inventor, the Math Kids spring into action. If Catherine, Stephanie, Justin, and Jordan can figure out the Great Triangle mentioned in Howell's will, they might just uncover who's behind the crash and Agent Carlson's kidnapping--if they don't get caught themselves!"-- Provided by publisher juvenile Dawei Keer, Xiangnong Aotuer zhu ; Liu Yongjun yi In simplified Chinese scripts. Children's stories Kidnapping Juvenile fiction Mathematics Juvenile fiction School children Juvenile fiction 813.6 9787531975441 PPAK 231011 20231011163705.0 eng