Delilah Dirk is a woman who is kind of a pirate and kind of Robin Hood but mostly just notoriously awesome as she steals from the rich and busts out of jail and swings her sword around and wows those around her along the way. This is basically her story and the story of a man entranced by who she is and what she does without it being a crazy romantic trope.
In other words, yeah, cool!
It appealed to me because it was a fun, action-packed adventure that did a lot of fun things with a classic type of story. Others who are concerned with gender representation and strong female characters will find plenty to love here as well, as Delilah is independent and awesome in all the right ways and the story isn't sexualized or filled with romance in the least. And it's rare for a book of late to straddle that line without going fully in either direction, and Tony Cliff somehow figured it out.
The next volume simply cannot come soon enough. I absolutely loved this, and it comes highly recommended. A well-done read.