"A REAL SPINE WEAKENER"
An author so bad ass he only needed to use a single name and what a name, Griff. Nice UK Mushroom title that is becoming increasingly difficult to track down. Classic Gangster cover, very primitive and typically violent. I'm guessing they used the name "Hank" to cash in on the popularity of author Hank Janson?
Inner cheesecake art.
Published sometime in the 1950's, but like many books published in this era it's undated and information is scarce. Griff has his name attached to a number of classic titles like Curves Can Cast Shadows, Vice Queens on Broadway and Trading With Bodies. Essential stuff.