The planet Albion is a joint British-French colony in the French Arm of space. The Kafer invasion of known space has begun, and arrives on Albion with sudden and terrifying savagery. A disparate group of soldiers band together as they flee the alien attack on the British continent of Wessex.
Under the countryside runs a network of emergency tunnels and bunkers, colloquially known as The Underground. This provides the only route to the communications station from which the beleaguered British forces can alert their commanders and allies. No-one can tell if the Kafer have found the Underground, or what traps they may have set. One small team of specialists must find their way through the Underground to the right station. From there, they must activate the communications equipment and send the necessary messages. Then all they have to do is to stay alive.
Because even on a distant planet in the far future, the best adventures are still found… underground!