Nothing goes right on Heritage. Only the fussies, the tiny robots with the unending task of clearing away the omnipresent dust of the colony, are on the move. Everything else is dead, unmoving, the colonists dirt poor and getting poorer And meaner. The only hope for the future is a little red-headed girl called Sweetness, bearing an uncanny resemblance to someone in the Doctor's past. She's the ward of Professor Wakeling, the brilliant genetics expert whose work is finally going to put Heritage back on the map. But Wakeling's successes are built on the colony's misfortunes - and corruption. The Doctor needs to know what exactly happened to an old friend; why there are certain things not even the most upright colonists will talk about; who lies in the grave that stretches out alone beside a burned-out farmhouse. Are Wakeling's experiments the best hope for Heritage's future - or the surest way to drag it to its death?