Across the world, J. K. Rowling's new book has been rocketing to the top of the bestsellers lists within a few days of its release. It's no surprise that reviews have been luke-warm so far - Potter-madness was always going to be a tough act to follow, but I look forward to trying Rowling out as an adult author sometime soon. Equally unsurprising is the presence of assorted versions of the 50 Shades trilogy, and Mark Owen's account of the mission to capture Osama Bin Laden. Jeff Kinney and Rick Riordan the early favourites in this season's childrens reads too.

The top ten bestselling books in September, according to Amazon US:

1
The Casual Vacancy by J.K. Rowling book cover

The Casual Vacancy
J. K. Rowling 
$20.90 from Amazon
2
The Mark of Athena by Rick Riordan book cover

The Mark of Athena
Rick Riordan
$11.04 from Amazon
3
No Easy Day by Mark Owen book cover

No Easy Day
Mark Owen 
$15.65 from Amazon
4
Fifty Shades of Grey by E L James book cover

Fifty Shades of Grey
E L James
$9.57 from Amazon
5
Fifty Shades Trilogy by E L James book cover

Fifty Shades Trilogy
E L James
$27.74 from Amazon
6
The Third Wheel by Jeff Kinney book cover

The Third Wheel
Jeff Kinney 
$7.75 from Amazon
7
Killing Kennedy by Bill O'Reilly book cover

Killing Kennedy
Bill O'Reilly
$16.28 from Amazon
8
Eat to Liver by Joel Fuhrman book cover

Eat to Live
Joel Fuhrman
$5.99 from Amazon
9
Fifty Shades Darker by E L James book cover

Fifty Shades Darker
E L James 
$9.57 from Amazon
10
Gone Girl by Gillian Flynn book cover

Gone Girl
Gillian Flynn
$13.94 from Amazon
Prices correct on 30/09/2012