Space 1889 (04): The Lunar Inheritance

The Moon. Luna. Devoid of life. Of no interest to the British Empire. But appearances can be deceptive as the crew of HMS Indomitable discovers when an alien weapon cripples their ship. They must undertake a perilous journey deep into the mysterious underworld of Luna - a world certainly not devoid of life - and rescue a man who holds the key to a millennia-old mystery.