In the comics, Jessica Jones is a former B-list superhero who screwed up massively and became a private detective in Hell's Kitchen. She's also noted for her, shall we say... poor life choices, and this show has potential for a lot of tie-ins to Daredevil as well as the upcoming Luke Cage (in the comics, Luke and Jessica hook up from time to time). This will give you a taste of what the tone of the show will be like:
I love it. If this show is half as good as Daredevil, it'll be one to binge watch in a weekend. Really looking forward to it.