The parenthetical bit "(A Barnaby and Hooker Graphic Novel #3)" is a bit confusing. From what I gather, there are three Barnaby and Hooker series - Metro Girl, Motor Mouth, and Troublemaker - but as far as I can find only Troublemaker has a graphic novel form.
I do wonder to whom this book is aimed. This being the only Evanovich title I've ever read, I suspect it's meant for those who already follow any of the Barnaby and Hooker series, since the graphic novel doesn't do a great job at introducing the characters (it doesn't help that the two main characters, Sam and Alex, both have dual gender names), or explaining why Sam - I mean, no, Alex - continues to hang out with and go on escapades with (and...date, I think? Or...just pretend to date, maybe?) Sam despite her showing absolutely no signs whatsoever or anything less than hating his guts.
So, benefit of the doubt, perhaps someone already familiar with the characters might gain some appreciation from this GN. But I still wonder. At the risk of pigeonholing Janet Evanovich fans, aren't they mostly...oh, how should I say it... the demographic that generally speaking isn't interested in the comic book form?
Hopefully Troublemaker (GN) can get Evanovich readers to seek out more graphic novels (how about, say, the other illustrative works of Joëlle Jones? She's quite talented.), because it's not a good way to get graphic novel fans to seek out more Evanovich novels.