Midnight on the Moon by Mary Pope Osborne

Jack and Annie travel to a futuristic moon base where they explore outer space in search of the final clue to break a magical spell. Wearing space suits, they venture onto the lunar surface, discovering a secret message and an unexpected helper. Their mission is full of suspense, wonder, and a race against time. The book blends science fiction with imagination and magic. It’s one of their most thrilling and far-out journeys yet.