Ari, the new kid from Texas, hasn't made any friends yet. While searching the creek near his home for crawdads, he encounters Cricket, a neighborhood girl who he's not sure is interesting or annoying. When they spot an unusual red flag on a post and dig underneath it, they discover a metal box. Inside rests a folded piece of paper with the sentence: Find out why Mr. Krishnaswami's fish are dying. The two would-be detectives decide that's exactly what they'll do. Cricket, who has a gift for math, and Ari, who has a gift for science, combine their talents as they attempt to solve the mystery through a series of experiments. They land on a solution only to discover a surprise awaiting them in the buried metal box. Who left the surprise and what mystery might they have to solve next?
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