In the thirty-first century, energy prospecting is as crucial to humanity as it was a thousand years earlier, only now the rigs and drill platforms have a new territory: comets.
One such speeding rock, Stromboli’s Comet, is the biggest catch in the prospecting business, but more rigs have vanished hunting it than any other comet. And no one knows why.
Arriving aboard the Lokev, a deep-space rig captained by the veteran comet-chaser Pavel Komen, the Doctor, Val and Tom are soon caught up in a battle for survival as the Lokev attempts to make comet-fall on Stromboli’s Comet in search of a lost rig, the Urkübl, and its missing crew.
But there is more to Stromboli’s Comet than energy-rich minerals. Someone – or something – has infiltrated its interior, with deadly intentions.
As the Doctor searches for survivors of the Urkübl and uncovers a terrible trap, divisions in the crew of the Lokev leave Val and Tom facing an alien intruder who will stop at nothing to achieve its mission.
Who has hijacked Stromboli’s Comet and what is it so intent on protecting? Only the Doctor can uncover the answers, and they will lead him to confront an enemy from his distant past…