Sally Rooney's Normal People's novel, rave reviews and a BBC drama agreement have been named Best Waterstones in 2018.
The novel tells the story of a dreadful story after the financial crisis, the relationship between two school friends in a small Irish town.
According to Waterstones, the book confirms 27-year-old writers "one of today's most important novelists."
Rooney in Dublin said he was "very honored".
Normal People Rooney is the second novel and Man Booker Prize this year was released for the first time.
The Guardian was named as a "classical future" as "excellent" of Irish contemporaries, and the independent one was "quite surprising".
The book will be the BBC drama section of the Irish director, Lenny Abrahamson, with the 2014 Frank album.
In the next film, Room, winner of the Academy Award for Best Actress Brie Larson in 2016.
Other Waterstones shortlist books were:
- Everything we know about love Dolly Alderton
- Classic Book of Penguins Henry Eliot
- Why are we wrong politicians? Isabel Hardman
- Time Color: New World History, 1850-1960 By Dan Jones and Marina Amaral
- Circe Madeline Miller
- Secret range: The story of the law and how damaged it is The Secret Barrister
- I am a child's tree: a natural poem per day each year Selected by Fiona Waters and illustrated by Fran Preston-Gannon
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