Eventually the issue comes to Mrs Mumby's ears and she manages to convince the British government to send a ship to Georgium Sidus (Uranus) to investigate.

As the ship nears, Mothstorm is attacked by Moth riders, During the ambush Art, Ulla and Sir Richard manage to evacuate and float down onto the surface of Georgium Sidus where they later come in contact with mer-people who live in the gas oceans.

Mrs Mumby later retakes the form of one of her old bodies when she meets up with Art and the crew of the Sophronia on the tin moon.

In a turn of events Art, Mrs Mumby and Myrtle are able to kill the Mothmaker, and the Snilth all turn to Myrtle of all people to teach them all how to become gentle ladies, and make Sillisa their queen after they discover that she is a descendant of a long lost line of queens, the last of which had attempted to rebel against the Mothmaker.

The book ends with the Snilth leaving Earth to put their mini sun to orbit Hades (Pluto) and inhabit the planet under the rule of Sillisa.