ISBN 978-1-55453-276-6 (hc)
ISBN 978-1-55453-277-3 (pb)
Illustrated by Pat Cupples
When Lu and Clancy find a map labeled "Top Secret" and a note written in code in Aunt Izzie's trunk, the mystery begins. Is Aunt Izzie a spy? The canine sleuths dress up in disguises to follow her. This case proves so full of surprises that the detectives need all their skills and nifty spy stuff to solve it.
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