ANSWER: Kate Atkinson
Explanation:
British writer Kate Atkinson on 4th January 2016 won the novel of the year prize at Costa Book Awards 2015. She has won for the second time in 3 years. She won the award for A God in Ruins, a story of war and its aftermath. With this, she became the first author to receive the Costa novel prize three times: for A God in Ruins in 2016, Life After Life in 2013 and Behind the Scenes at the Museum in 1995.