De Coster made her debut in 2000 with her first book, called
Under Each Other, a collection of dark tales about the disintegration of an unusual family.
Under Each Other appeared in the "Nieuw Wereldtijdschrift (NWT)". In 2002, at the age of 26, De Coster published her debut novel,
Vrije Val (Free Fall). In late 2009, she replaced
Aaf Brandt Corstius as a daily columnist for
nrc.next newspaper. De Coster is also a visual artist. ==Publications==