Catherine Isaac was born in 1974 in Liverpool, England. She studied History at the University of Liverpool, before completing a postgraduate diploma in Journalism at Glasgow Caledonian University.
She began her career as graduate trainee at the Liverpool Echo. At 27, she was appointed Editor of the Liverpool Daily Post and held the position for five years. She wrote her first book, Bridesmaids, while on maternity leave and under the pseudonym Jane Costello.
She has since written nine books, all Sunday Times best-sellers in the UK. 'You Me Everything' is her first novel writing as Catherine Isaac.
She lives in Liverpool with her husband Mark and three sons. In her spare time she likes to run, walk up mountains in the Lake District and win at pub quizzes, though the latter rarely happens.