Michelle Harrison was born in 1979 and grew up in Grays, Essex. She has a degree in illustration, and is a former Waterstone’s bookseller and assistant editor at Oxford University Press. She now writes full time and has a son, Jack, and two cats.

Her first novel, The Thirteen Treasures, won the Waterstones’ Children’s Book Prize, has been sold in over sixteen countries and was followed by The Thirteen Curses and The Thirteen Secrets. She has also published Unrest, a stand-alone ghost novel for teens and is now working on a second young adult novel. Her latest book is One Wish, a return to the world of The Thirteen Treasures.

David Tazzyman is an internationally acclaimed award-winning illustrator. He illustrated Andy Stanton's Mr Gum series, which went on to win numerous awards including the first Roald Dahl Funny Prize, and he has illustrated many children's picture books, including You Can't Take an Elephant on a Bus and The Truth According to Arthur.