Somewhere among the myriad worlds there is one which has lost its sun. All the hydrogen's still there at the centre of the solar system, where the sun used to be, but the world is in darkness and will eventually die if something is not done. Kite is following a trail of changes across worlds - changed laws, changed histories, changed lives; hoping to locate the missing sun and return it. But the very act of searching will change more than she could imagine...