X-link to the Comics thread for a bundle with some mystery/crime graphic novels in it:
Humble Comics Bundle IDW Creator Showcase contains the Eisner Award-winning adaptations of the late Mystery Writers of America Grand Master Donald E. Westlake's (
SYKM, Wikipedia) Parker novels written as Richard Stark, with artwork done by the late Darwyn Cooke (
Wikipedia).
One of them is available at the $10 tier, and 3 more at the $18 top tier, which is good value for money compared to what you'd pay for them normally, even if you read nothing else in the bundle. There's also some other mystery/crime-ish comics in there, but the Cooke/Parker adaptations are one of the main draws, IMHO.