Mask contains twenty-one short stories on the theme of Mask selected by the judges from a large entry for the 2021 H.G. Wells Short Story Competition. Stories are divided into two groups: authors 21 years of age and under and authors aged 22 years and above and include works by Jessica Brien, Clara Chiu, Sophia Felsinger, Sarah Holm, Mia Ramage, Sumedha Sengupta, Sarah-Kate Simons, Nathan Steward, Weiyen Tan, Houssam Alissa, Fija Callaghan, Peter Collins, Simha Haddad, Katherine Haynes, E.S Heffernan, Tony Hunter-Craig, Bethany Ridley-Duff, Lee Stoddart, Sarah Townend, Dan Vanvik and Stephen Webb.