Lottie Mills was born in Hampshire and grew up in West Sussex, Hertfordshire, and Essex. She studied English at Newnham College, Cambridge, and contributed to Varsity and The Mays during her time there. In 2020, she won the BBC Young Writers' Award for her short story 'The Changeling', having been previously shortlisted in 2018. Her work has been broadcast on BBC Radio 1 and BBC Radio 4, and she has appeared on programmes including Look East, Life Hacks, and Woman's Hour to discuss her writing. Monstrum is her debut book.