In landing the prize, it beat titles including Boris Johnson's take on Churchill, The Churchill Factor.
It beat titles by David Almond and Shirley Hughes to win the prize, which was voted for by over 300 school children.
It beat titles by authors including Jeff VanderMeer, Robert Jackson Bennett, Jo Walton and Katherine Addison to the best novel prize, with other winners at the Saratoga Springs convention including Ramsey Campbell and Sheri S Tepper, who took life achievement awards.
It beat titles including Norwegian author Karl Ove Knausgaard's hit A Man in Love, and Birgit Vanderbeke's classic German debut The Mussel Feast, to take the £10,000 prize, which is shared equally with Blasim's translator Jonathan Wright.
The novel, Mulligan's third, beat titles including the award-winning David Almond's My Name is Mina to win the Guardian prize, the only children's award judged by writers.
The Loney beat titles including Paula Hawkins's international hit The Girl on the Train, and Harper Lee's Go Set a Watchman to the top prize at the British Book Industry awards this evening.
To stand any chance of staying up, they must beat title-chasing Kidderminster and hope other results go their way.
He surprisingly led a depleted German squad into the Finals, beating title favorites Slovenia in the quarter-finals and Spain in the semi-finals on the way.
Lewis Grassic Gibbon's classic novel Sunset Song has been voted Scotland's favourite novel, beating titles including JK Rowling's first Harry Potter story to the top spot.
