A wealth of information in an engaging package that should find an enthusiastic audience, particularly among middle schoolers.
--Kirkus Reviews

With well-chosen subjects (including many women and African Americans who used their marginalized positions to gather information) and contagious enthusiasm for the spy world's 'tantalizing mysteries, ' this makes a strong choice for both avid and reluctant readers alike.
--Booklist

Provides solid details along with fascinating snippets in an easy-to-follow text in which he tells stories about his subjects and the way they were trained...provides background details and places the role of spying more particularly within the context of American history and politics.
--VOYA

Will appeal to anyone who is interested in spies and espionage throughout the history of our country
--Library Media Connection

Janeczko's lively writing portrays history with all of the drama and flair of a top-notch spy novel.
--SLJ Teen