Barack Obama's A Promised Land (Penguin) has risen into the Amazon Charts' Most-Sold: Non-Fiction top spot, after debuting a week ago, ahead of its publication. The title earned the "unputdownable" tag, meaning Kindle readers finished the memoir faster than similar titles—impressive, given its 768-page length. 

Matthew McConaughey's Greenlights (Headline) joined the former US President in the top two. Obama and McConaughey also topped the Most-Read: Non-Fiction chart, with long-running number one Alan Partridge's From the Oasthouse (Audible) elbowed into third.

Richard Osman's The Thursday Murder Club (Penguin) rose two places in Most-Sold: Fiction to displace David Walliams and Tony Ross' Code Name Bananas (HarperCollins) from the top. 

Announced as the Booker Prize-winner last week, Douglas Stuart's Shuggie Bain (Picador) entered the Most-Sold: Fiction chart in second place, pushing Walliams to third.