Theowulf is twelve. He counts steps, checks every answer three times, and usually thinks toolong. But when a seventh door appears in his Berlin school, the very things others find strangeabout him may be what saves them all.Beyond the door lies the same courtyard six times over: steel and ropes, glass and rainforest, fire and ice. Hundreds of children from Berlin, Shanghai, Manhattan, and Riyadh arethere-but not a single adult.There is only one rule: You must leave through the same door you entered.Milan broke it. As his memories disappear, a fourteen-day race begins. Four children from fourcities can measure, calculate, question, and count. Each has exactly one piece of theanswer-and none of them can solve it alone.
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