Following his 2015 worldwide bestseller Her Last Tomorrow, his psychological thrillers were bought by Thomas & Mercer, an imprint of Amazon Publishing. Prior to the Amazon deal, Her Last Tomorrow sold more than 150,000 copies across all platforms and became one of the bestselling books of the year, reaching the top 10 in the overall Amazon Kindle chart and peaking at number 12 in the combined paperback fiction and non-fiction chart.
His Knight & Culverhouse crime thriller series has sold more than 250,000 copies worldwide, with his Kempston Hardwick mystery books being adapted as audio plays starring some of the biggest names in British TV.
In 2016, the Knight & Culverhouse Box Set reached storewide number 1 in Canada, knocking J.K. Rowling’s Harry Potter and the Cursed Child off the top spot only weeks after Her Last Tomorrow was also number 1 in Canada. The new edition of Her Last Tomorrow also reached storewide number 1 in Australia over Christmas 2016.
During the summer of 2016, two of Adam’s books hit the USA Today bestseller list only weeks apart, making them two of the most-purchased books in the United States over the summer.
In February 2017, Only The Truth became a worldwide bestseller, reaching storewide number 1at both Amazon US and Amazon UK, making it the bestselling book in the world at that moment in time. The same day, Amazon’s overall Author Rankings placed Adam as the most widely read author in the world, with J.K. Rowling in second place.
Adam has been featured on BBC television, BBC Radio 4, BBC Radio 5 Live, the BBC World Service, The Guardian, The Huffington Post, The Bookseller and a number of other news and media outlets.
In March 2018, Adam was conferred as an Honorary Doctor of Arts, the highest academic qualification in the UK, by the University of Bedfordshire in recognition of his achievements.
Adam presents the regular crime fiction podcast Partners in Crime with fellow bestselling author Robert Daws.