Adrian Tchaikovsky is the author of the acclaimed Shadows of the Apt fantasy series and the epic science fiction blockbuster Children of Time.

He has won the Arthur C. Clarke Award, a British Fantasy Society Award, and been nominated for the David Gemmell Legend Award.

In civilian life he is a lawyer, gamer and amateur entomologist.

Genevieve Cogman started on Tolkien and Sherlock Holmes at an early age, and has never looked back. But on a perhaps more prosaic note, she has an MSc in Statistics with Medical Applications and has wielded this in an assortment of jobs: clinical coder, data analyst and classifications specialist.

Although The Invisible Library was her debut novel, she previously worked as a freelance roleplaying game writer. She is also the author of The Masked City, The Burning Page and The Lost Plot, all in The Invisible Library series. Genevieve Cogman's hobbies include patchwork, beading, knitting and gaming, and she lives in the north of England.

Peter F. Hamilton was born in Rutland in 1960 and now lives in Somerset. He began writing in 1987, and sold his first short story to Fear magazine in 1988. He has written many bestselling novels, including the Greg Mandel series, the Night's Dawn trilogy, the Commonwealth Saga, the Void trilogy, The Chronicle of the Fallers, short story collections and several standalone novels including Fallen Dragon and Great North Road.