In this thought-provoking collaboration, Pratchett (the Discworld series) and Baxter (Stone Spring) create an infinity of worlds to explore with a fascinating premise.

Sir Terry Pratchett, OBE, was the author of more than 70 books, including the internationally bestselling Discworld series of novels. His books have been adapted for stage and screen, and he was the winner of multiple prizes, including the Carnegie Medal. In January 2009, Pratchett was knighted by Queen Elizabeth II in recognition of his services to literature. Sir Terry, who lived in England, died in March 2015 at the age of 66.

Stephen Baxter is an acclaimed, multiple-award-winning author whose many books include the Xeelee Sequence series, the Time Odyssey trilogy (written with Arthur C. Clarke), and The Time Ships.