The Wheel. A ring of ice & steel turning around a moon of Saturn & home to a mining colony supplying a resource-hungry Earth. It's a bad place to grow up. The colony has been plagued by problems. Maybe it's just gremlins just bad luck. But the equipment failures & thefts of resources have been increasing & there have been stories among the children of mysterious creatures glimpsed aboard the Wheel. Many of the younger workers refuse to go down the warren-like mines anymore. & then sixteen-year-old Phee Laws surfing Saturn's rings saves an enigmatic blue box from destruction. Aboard the Wheel the Doctor Jamie & Zoe find a critical situation
- & they are suspected by some as the source of the sabotage. They soon find themselves caught in a mystery that goes right back to the creation of the solar system. A mystery that could kill them all.