Malorie Blackman has written over seventy books for children and young adults, including the Noughts & Crosses series, Thief and a science-fiction thriller, Chasing the Stars. Many of her books have also been adapted for stage and television, including a BAFTA-award-winning BBC production of Pig-Heart Boy and a Pilot Theatre stage adaptation by Sabrina Mahfouz of Noughts & Crosses. There is also a major BBC production of Noughts & Crosses, whose soundtrack was curated by Roc Nation (Jay-Z's entertainment company) as executive music producer. In 2005 Malorie was honoured with the Eleanor Farjeon Award in recognition of her distinguished contribution to the world of children's books. In 2008 she received an OBE for her services to children's literature, and between 2013 and 2015 she was the Children's Laureate. Most recently Malorie wrote for the Doctor Who series on BBC One, and the fifth novel in her Noughts & Crosses series, Crossfire, was published by Penguin Random House Children's in summer 2019.

Diane Ewen is a British illustrator, born in Walsall, in the West Midlands. She has always been in love with art and graduated from the University of Wolverhampton with a B.A. Honours Degree in illustration. Diane likes to create illustrations that are hand-drawn in pencil before painting in watercolour and acrylics prior to embellishing them using Photoshop but she also enjoys creating designs digitally; constantly developing her style as she progresses. She likes the fact that illustrations are the first things that entice the reader to engage with a book and is inspired by the use of vibrant colour.