No doubt you've left them by now and are mucking about all depressed doing absolutely nothing useful and in no way preparing to leave for good. I should know; I'm you. You're me. It's all back-to-front, isn't it? It's hard to explain on a letter, or series of letters, but do not forget to write them in red ink and leave them back in /emParisem. By then you may be able to take her for fish fingers and custard. Do Americans eat fish fingers in custard? Everybody in the world should eat fish fingers and custard.
Of topic, get back on the train track.
You can't leave them. You have run for far too long, and you can't do that now, not anymore. You don't have just Grace to worry about now. The rest of the universe is in trouble. She'll be growing up in a wasteland of stars if you stop now. Yes, they're safe for the moment, but they're waiting for you to come back to them, to rescue them even though they seem like they don't need rescuing. But you need her, just as much as she needs you.
Think about her. Never forget her. On top of that wheel you saw her perfectly in the sunlight, and you thought, 'How lucky am I, to be thrown into a lot with such a miracle. Here I am in a tweed coat and bow tie with all these problems but she's still sticking around.' You knew she'd stick around for a very long time. Time can be rewritten, but that doesn't mean it should be.
Go to the Lidymac star system. The Floating Libraries. Ask for a lady named Hymn – careful, too, she's a grabber. Look in the Earthrealm sections. There you should find what you're looking for, and don't touch the yellow mold. We're pretty smart so you'll figure out why soon enough.