Cover by John McDermott
I have to admit I haven't read any of the books in this series. (It's more of a husband kind of thing.) But I am quite fond of the film series featuring Dean Martin as a kitschy & drunk version of Hamilton's character.
In case you're unfamiliar with said movies, this super fun montage from The Silencers, aka the film loosely based on this book (the operative word being loosely), will provide plenty of inspiration to remedy that.
And since it was available, here's the first four minutes and 26 seconds to get you started...