The Wheel of Ice — Stephen Baxter

Resilience. Remembrance. Restoration.
Whatever the cost.

Hurtling through a vortex beyond time and space is a police box that's not a police box. The TARDIS has carried the Doctor and his companions, Jamie and Zoe, to all sorts of places, but now, when they don't want to go anywhere, the TARDIS makes a decision for them. Like it or not, they're coming in for a landing, who knows where or when…

The Wheel. A ring of ice and metal turning around a moon of Saturn, home to a mining colony supplying a resource-hungry Earth. It's a bad place to live -- and a worse place to grow up.

The colony has been plagued by problems. Maybe it's only a run of bad luck, but the equipment failures and thefts of resources have been increasing. And there are stories among the children of mysterious creatures glimpsed aboard the Wheel. Some of the younger workers are even refusing to go down into the warren-like mines any more.

And then one of them, surfing Saturn's rings, saves an enigmatic blue box from destruction.

Once on the Wheel, the Doctor and his companions face a critical situation when they become suspected by some as the source of the ongoing sabotage.

They soon find themselves caught in a mystery that goes all the way back to the creation of the solar system. A mystery that could destroy the Wheel -- and kill them all...