Darkheart:  A faded neutron star surrounded by dead planets. But there is life on one of these icy rocks – the last enclave of the Earth Empire, frozen in the image of another time. AS the rest of the galaxy enjoys the fruits of the fledgling Federation, these isolated Imperialists, bound to obey a forgotten ideal, harbour a dark obsession. The Doctor, Jamie and Victoria arrive to find that the Federation has come to integrate the lost colony, whether they like it or not. But relations and allegiances are changing in the Federation camp.  The Veltrochni – angered by the murder of their kinsmen – have a very different agenda. And another time traveller is manipulating the mission for his own mysterious reasons.