Born in Arrowtown, New Zealand, Maria Lewis later moved to the Gold Coast with her mother and grandparents. She holds a Bachelor of Journalism from Bond University, but began her journalism career as a sixteen-year-old cadet at the Gold Coast Bulletin, covering the crime and police beat. She later worked for the Daily Telegraph and Sunday Telegraph, as well as theDaily Mail Australia, this time as an entertainment and show-business reporter. She has also worked as a freelance writer for a wide range of publications, as well as a television panellist and podcaster, with a particular focus on film and television (especially queer representation and feminism in film).
Lewis's debut novel, Who's Afraid, was published in July 2016: the first sequel (of a planned series of five) was released in January 2017. Her standalone mermaid/merman horror novel, It Came from the Deep, was published in late 2017.