Behind the laundromat, where there had always been a plain brick wall, Milo found a little door no taller than he was. He ducked inside. A small clockwork librarian slid a card across the counter. Tiny gears ticked inside her chest. "We lend tomorrows here," she said. "Borrow one good day from your own future and spend it today. Just return it by the deadline on the card."

"Can I borrow a day for someone else?" Milo asked. He was thinking of his grandpa, who'd been tired and sad for weeks. The librarian tilted her head, gears clicking. "That is allowed," she said. "But the cost still lands on you. Are you sure?"

"I'm sure," Milo said. He borrowed a bright, happy day and gave it to his grandpa. That afternoon, Grandpa laughed for the first time in weeks and took Milo fishing. It was the best day ever. Then Milo remembered: he still had to pay the day back himself, by Friday.