Oh, oh, oh, it's the publication event of the year - the one we've all been waiting for - I know I'll have it draped over my sun-tanned body-bits on the beach, yes, DSM-5 is finally here! Yahoo... Ok, maybe you have to be a psychologist to find that more exciting that Dan Brown's lastest missive but hey, don't knock it until you've diagnosed yourself by it! By the way, didn't it used to be titled in Roman numerals? It's dumbing down gone mad I tells ya! And Seuss-y, you brightly coloured loon, you're on my list too. But who is this beardy, happy man please America? I've never heard of Mark Schlabach. Tell me more...

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

Inferno by Dan Brown book cover

Dan Brown
$17.15 from Amazon
And the Mountains Echoed by Khaled Hosseini book cover

Khaled Hosseini
$16.08 from Amazon
DSM-5 APA book cover

American Psychiatric Association
$123.49 from Amazon
Joyland by Stephen King book cover

Stephen King
$7.77 from Amazon
Oh, The Places You'll Go by Dr. Seuss book cover

Dr. Seuss
$9.89 from Amazon
The Great Gatsby by F. Scott Fitzgerald book cover

F. Scott Fitzgerald
$8.41 from Amazon
Lean In by Sheryl Sandberg book cover

Sheryl Sandberg
$13.72 from Amazon
Happy, Happy, Happy by Mark Schlabach book cover

Mark Schlabach
$13.99 from Amazon
Entwined with You by Sylvia Day book cover

Sylvia Day
$8.30 from Amazon
The 100 by Jorge Cruise book cover

Jorge Cruise
$14.76 from Amazon
Prices correct on 31/05/2013