“Ms. Hopkinson slips lots of age-appropriate wartime history and a number of real individuals (including Eisenhower)—as well as practical details about codes and ciphers and how to break them—into this info-packed adventure for sleuth-loving readers.” —The Wall Street Journal
“This middle grade mystery novel starts with a bang and sends readers on a breakneck journey through World War II London.” —School Library Journal
“Hopkinson has written a cleverly plotted, page-turning mystery that vividly evokes wartime Britain… Fans of puzzles, mysteries, and historical fiction will be delighted by Hopkinson’s latest.” —Booklist
“Red herrings, a poignant Bradshaw family backstory, ciphers to decode, a subplot regarding a young Jewish refugee friend of Bertie’s, cameos by real-life historical figures (General Eisenhower and his dog; cipher expert Leo Marks)—there’s certainly no shortage of entry points for young readers, and never a dull moment.” —The Horn Book
