Sally Rooney's novel Normal people, who received horrifying reviews and an agreement to become the BBC drama, were named best book by 2018 from Waterstones.
The novel tells the intimate story of an on-off relationship between two school friends in a small Irish town after the financial crisis.
Waterstones said the book confirmed the 27-year-old author as "one of the great writers at work today."
Rooney, who was born in Dublin, said he was "very surprised to honor."
Normal people are Rooney's second novel and at the beginning of this year they were awarded the Man Booker Award.
It was described as a "future classical" Guardian, "Outstanding" Irish Times, and "Pretty Amazing" Independent.
The book will become BBC Irish series director Lenny Abrahamson, who was named Frank in 2014.
His next film, Room, won Brie Larson's best Oscar in 2016.
Other books on the list of selected water stones were:
- All I know about love by Dolly Alderton
- Penguin Classics Henry Eliot
- Why are we getting bad politicians? by Isabel Hardman
- Time Color: A New World History, 1850-1960 by Dan Jones & Marina Amaral
- Circe Madeline Miller
- Secret Advocate: Stories about the law and its violations from a secret lawyer
- I Am Seed Growing with a Tree: A Natural Poem for Every Day of the Year selected by Fiona Waters and illustrated by Frant Preston-Gannon
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