Gr 3–7— Gidwitz's latest is absolutely everything a reader could want in a World War II spy novel. Max is sent away from Berlin by his Jewish parents at the brink of WWII. Alone and scared, Max finds himself accompanied by two immortal and incorporeal creatures, a dybbuk and a kobold. Named Stein and Berg, these two offer comedic insights and observations in classic Gidwitz style, with sarcasm and wit in equal measure. Max must engage his full mental capacities to survive anti-Semitic bullies. He then must work his way into training to become the youngest spy for Britain, all in hopes of getting sent back to Berlin to be reunited with his parents. Brilliant, funny, and full of twists and turns that engage both the heart and the mind, this novel will have readers clamoring for the follow-up in the duology. Newbery Honoree Gidwitz is at the top of his form using humor, fantastical creatures, and in-depth research to bring this story zestfully to life. VERDICT Highly recommended for all collections serving middle grade and older readers who enjoy smartly written historical novels.— John Scott

A determined refugee will do whatever it takes to get back to his parents-even becoming a British spy in Nazi Germany.When 11-year-old Max Bretzfeld, a Jewish boy from Berlin, is sent to England on the Kindertransport in 1939, he's accompanied by two tiny men on his shoulders whom only he can see. The German kobold and Jewish dybbuk rarely interact with Max, but they comically comment on his circumstances. And such circumstances! After a working-class upbringing, he's fostered in England by Jewish baron Lord Montagu. Most of the white non-Jewish people Max encounters are shudderingly classist, racist, and antisemitic, but after a childhood in Nazi Germany, this is hardly new. Nonetheless, he'll do anything to get back to his parents, and thus, Max sets out to become a spy. While it may be hard to convince British intelligence to send him back to Germany, Max will do whatever it takes. Despite the compelling premise and likable characters, readers will have to wait for the sequel for a payoff. After a strong start, the kobold and dybbuk are relegated to the roles of Greek chorus, and the story's fascination with the real-life people who inspired the secondary characters is such that various questions concerning them are intriguing but remain unresolved in this volume. Nonetheless, this book-packed with sideways thinking, sociopolitical insights, and a Marmite-eating kangaroo named Kathy-delights.A duology opener with a truly likable hero and clever puzzling. (historical note, annotated bibliography) (Historical fiction. 8-11)

After Kristallnacht, things continue getting worse for German Jews, prompting the parents of highly intelligent 11-year-old Max Bretzfeld to send him to England via the Kindertransport. Though Max doesn’t want to go—especially because he often feels as if he’s the only one looking out for his meek parents—they insist. Max ends up living with the Montagus, an aristocratic family of British Jews, and he did not arrive alone. He’s joined by two invisible companions: a dybbuk, or Jewish evil spirit, on one shoulder and a kobold, or German folk spirit, on the other. When Max realizes that one of the Montagus is a British spy, he endeavors to become one as well, believing it to be the quickest way to return to Berlin to search for his parents. Gidwitz (the Unicorn Rescue Society series) imbues Max’s first-person voice with plentiful charm and intellect, making him an irresistible and irrepressible protagonist even his otherworldly tormentors can’t help but grow fond of. The compelling plot, which occasionally stretches credulity, boasts an exciting mixture of triumphs and perils, leading up to a cliffhanger ending that will have readers clamoring for the sequel. Ages 8–12. Agent: Sarah Burnes, Gernert Company. (Feb.)