Mortimer is from West London and attended Latymer Upper School.
[1] She studied English Literature at the University of Bristol, and has worked in marketing and as a screenwriter.
[3] Mortimer has described her first novel, Maps of Our Spectacular Bodies, as "an elegy to my mum and to our relationship".
Moving between Lia’s past and present, the book is a look at memory, mother-daughter relationships, and coming to terms with death".
[4] Maps of Our Spectacular Bodies won the 2022 Desmond Elliott Prize, which is awarded for a debut novel published in the UK or Ireland.