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Johnny Dixon is worried about Professor Childermass. The professor has always been an odd duck, but lately his behavior has been positively bizarre. He’s been talking to himself and stalking down the street with his collar turned up and his hat over his eyes, and now he won’t return Johnny’s calls. Johnny’s afraid that the professor’s old age is starting to get to him, but he will soon find it’s something far more amazing—and far more dangerous.

Maya’s grandmother, Halmunee, may be losing her memory, but there’s something almost magical about the way she cooks. Whether Halmunee serves salty miyeokguk or sweet songpyeon, her stories about Korea come to life for Maya. Then one day, something extraordinary happens: a single delicious bite of patbingsu transports Maya and Halmunee back into one of Halmunee’s memories. Suddenly they’re in Seoul, and Halmunee is young. This is just the first of many secrets Maya will uncover: that she and her grandmother can time-travel, and they aren’t the only ones with this ability.