Sarah Crossan is originally from Dublin and now lives in Hertfordshire. She trained as an English and drama teacher. Her verse novel about conjoined twins, One, won many awards including the 2016 CILIP Carnegie Medal and was joint winner of the 2016 CLiPPA. Her earlier verse novel The Weight of Water was also shortlisted for both of these awards. She is the co-author with Brian Conaghan of We Come Apart. Her verse novel Moonrise was shortlisted for the CLiPPA 2018.