Every Day is Mother's Day

Every Day is Mother's Day  was published in 1985. It is Mantel's first published novel. The book follows a widowed psychic, Evelyn, who discovers that her mentally disabled daughter, Muriel is pregnant. Set in the 1970s, it is seen as a dark comedy, and is partially inspired by Mantel's own time spent as a social worker. 

She published a sequel to this book, Vacant Possession, in 1986.