The diverse Code Busters kids are excited for their field trip to Angel Island, the Ellis Island of the west. Japanese American Mika hopes to find a secret message left by her ancestor, but the kids also uncover forged historical artifacts. New elements such as Japanese puzzle boxes keep this sixth interactive-mystery installment fresh. Key and puzzle solutions are appended. (c) Copyright 2017. The Horn Book, Inc., a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.

The five sixth-graders of the Code Busters Club research their diverse family histories before a middle-school field trip to Angel Island in San Francisco Bay. After Mika discovers that her great-great-grandfather hid a treasure in the historic immigration station there, her friends help her search for it, despite frightening attempts to thwart them. Readers who like to solve the mysteries in their books will have little trouble spotting the villain in this story. But fans of the Code Busters series will look forward to the many codes and other puzzles sprinkled throughout the text, with keys and solutions provided in the extensive back matter.--Phelan, Carolyn Copyright 2016 Booklist