The family adventure film tinged with nostalgia unfolds in 1986, a time when space exploration was in full swing. An exceptionally gifted dreamer, 11-year-old Jim, lives with his father, Graham, who is destined to become the first British scientist to go into space.

But when Jim finds out that his dad has been lying to him and has aborted his mission, the little boy’s bearings are thrown into disarray. Luckily, Jim is able to count on Emma, a new classmate of his. Together, despite their polar-opposite personalities, they rise to a challenge that is crazy and exciting in equal measure, and which will gradually bring them closer together…