Story: After narrowly escaping a Federation vessel, Avon realises he needs greater energy cells to power the Stardrive. He plans to raid Servalan's base on Pherno, both for cells, and also because he is troubled by a nightmare involving her, which he feels was induced.
Tarrant and Dayna obtain some Zamazuki mark 5A 3500K energy cells (the new Stardrive is "rated no higher than 1400" according to Slave), though Avon's fears are founded by hallucinations on the planet's surface. There they overhear Servalan learning of the diadem of King Gheblakon, which will enhance her psychic ability. She already has one stone from the diadem, and shows her ability to mentally control Avon. Avon and Vila are teleported back aboard Scorpio, where Vila has stolen a map of Servalan's destination. They arrive before her on Terella, the "holiday planet".
After misfortunes on the planet, with Tarrant being tortured, the overloaded teleport malfunctioning and Vila sentenced to hanging, they eventually take the diadem by force. However, Servalan takes the trapped Vila's bracelet and teleports aboard Scorpio, demanding the diadem in return for Vila's life. Avon isn't convinced, but the others are, and so he reluctantly hands the diadem over. However, he claims he has a larger plan - the diadem can only become truly powerful by being placed in the Sevenfold Crown, which resides at co-ordinates 7342 1535 2649 5473.
They travel to the location, hoping to take the Crown off Servalan the second she places the diadem within it. However, as she does so, the Crown's original owners - bodiless creatures known as the Divani - turn against her, bringing the Crown's chamber crashing to the ground. Avon finds that a freak malfunction in the teleport has created an exact duplicate of him, the duplicate of which uses the Crown to stem the damage until they can all get away. When Scorpio leaves orbit, the unnamed planet implodes and Avon wishes a telepathic farewell to his "brother".