It's a bit odd to have some final thoughts at the start of a book, but as this is the end in a series of five I'd like to take the opportunity to thank everyone who stuck with me throughout the long cycle of Quantum Gravity's creation. It was made over a period of five years in which my entire real life got turned inside out. I don't credit that bit to anyone but myself, incidentally.

In no particular order then: thanks to Stephanie Burgis-Samphire, who gave me the first encouragement all those years ago and who is always there with sage advice and a big heart. Here's looking at you kid!

Thank you Simon Spanton, for being a sensitive and encouraging editor. Thank you Lou Anders, for being an inspiring and cheerleading editor. You guys rock.

Thanks also to John R. Parker, my agent, who went indie and started a new agency during QG whilst still keeping track of all the important details. Go team Zeno!

And finally thanks to you, the reader. I hope that you find this book to be a satisfactory conclusion to the story. I had a lot of fun writing it but mostly it was made with you in mind.