This is the first in a series of books based on the seven deadly sins, and also closely tied the the levels of hell from Dante's Inferno. This one deals with matters of the heart - or lust, rather.
The authors wanted it to evoke the feeling of an old (but evil) bible, so I did it up as black embossed leather with gold lettering. The filigree embossing around the border has imagry of skulls and the number seven worked into it, with the focus on a shiny flaming heart in the center.
I also created their logo, which is a penguin wearing a seven-tiered top hat. Yes, it is all very seven-centric.