It seems like a routine tourist trip, taking wealthy guests to the luxury hotel in orbit. But Danish engineers Marius and Abby do not look like tourists, in their plain coveralls. The rich industrialist and his family seem to fit the part better. Everyone on this trip has other plans in mind, plans that will lead to the next big step in humanity's spread beyond our home planet.

Set fifteen years in the future, inspired by the engineering cooperative Copenhagen Suborbitals, and relying only on realistic technology, Spacetug is founded on the belief that humanity's future in space depends on proper engineering.