Imperial Moon by Christopher Bulis

Imperial Moon is a Doctor Who novel featuring the Fifth Doctor and has been written by Christopher Bulis. In the year 1878 three ships from the British Imperial Spacefleet set a course for the moon.

The discovery of a mysterious diary, recalling a seemingly impossible journey, takes the Doctor and his companions back to a crucial moment in history -- and into certain danger.

The Moon is far from deserted in 1878 with hostile plant and animal life, the Doctor and his companion must join the British Imperial explorers to battle for freedom in a race against time before the lunar night approaches.

For night brings with it the Vrall, ruthless and cunning killers.

With the loss of one of their ships and their captain the British team become embroiled in a struggle to survive that tests duty and honour to their limits. Meanwhile, the Doctor must make a choice that will determine the future of an Empire -- and Earth itself.