Irish author Eimear McBride has won the Baileys Women's Prize for Fiction with her debut novel, A Girl is a Half-Formed Thing, which took her nearly a decade to get published.
The judges described it as "amazing and ambitious".
The prize is worth £30,000 - around €37,000.
Published a year ago, A Girl is a Half-Formed Thing has already built up an impressive literary track record.
It won the £10,000 Goldsmith's Prize for original fiction, was shortlisted for the new Folio Prize, was named the Kerry Group Irish Novel of the Year and is nominated for the Desmond Elliott Prize for first-time novelists.
It is a dark story of a young woman's relationship with a brother who had a childhood brain tumour.
The protagonist goes on a journey of spectacular self-destruction in an attempt to flee her demons.
McBride wrote the novel in six months when she was 27.