What Was Lost Was Lost" was the winner in the first novel category of the Costa Book Awards. O'Flynn received a £5,000 prize. It was short-listed for the overall Costa Book of the Year Award. The Costa Book Awards' judging panel, chaired by Joanna Trollope, praised the novel for "blending humour and pathos in a cleverly constructed and absorbing mystery." They described the novel as inventive, compelling, and poignant. "What Was Lost" was long-listed for the 2007 Man Booker Prize and the Orange Prize for Fiction. It was short-listed for the Guardian First Book Award. It won the Jelf Group First Novel Award
Waterstones Children's Book Prize Waterstones Children's Book Prize The Waterstones Children's Book Prize is an annual award given to a work of children's literature published during the previous year. First awarded in 2005, the purpose of the prize is "to uncover hidden talent in children's writing" and is therefore open only to authors who have published no more than three books. Beginning in 2012, the prize was divided into three categories: Picture Books, Fiction 5–12, and Teen. Each category winner receives £2,000 with an overall winner chosen from the three getting an additional £3,000 (thus the overall winner receives £5,000 in total). 2005 –