Long Earth by Stephen Terry/ Baxter Pratchett

Author of the bestselling Discworld series, SIR TERRY PRATCHETT is one of the UK's most popular -- and bestselling -- writers. His books have sold over 65 million copies worldwide and been translated into nearly 40 languages. He was awarded an OBE in 1998 and knighted in 2009 for his services to literature. He lives in Wiltshire. The author lives in Wiltshire.

STEPHEN BAXTER is one of the UK's most acclaimed writers of science fiction and a multi-award winner. His many books include the classic Xeelee sequence, the Time's Odyssey novels (written with Arthur C. Clarke) and Time Ships, a sequel to H G Wells' The Time Machine. He lives in Northumberland.