Allison van Diepen does an excellent job capturing the life of an inner city, high school-age drug dealer in Street Pharm. I have read Street Phram in several of my own English classes and my students devoured it. Diepen does an excellent job with authenticity in terms of word choice, which is one reason students love the book so much. Be warned, though, the novel does contain a lot of strong language.
Scott Westerfield's Uglies is another dystopian novel, this one dealing with the notion of beauty, conformity, and cosmetic surgery. Uglies is the first book in a trilogy, and it is a very interesting, and very important, read for young girls.
Divergent by Veronica Roth is a great high-interest book for so many reasons. The movie tie-in, for one, but the book allows students to make real-world connections to topics like bullying, young love, and the social hierarchy of teenagers.
The dystopian genre is an excellent way to engage readers, especially those who are struggling. One teacher uses literature circles and various dystopian novels to accommodate her students' varying academic levels and interests.
This list of Hi-Lo books, compiled by School on Wheels, covers every reading level, starting with second grade. A great detail about this list is it not only provides a Reading Level beneath each title, but it also lists an Interest Level. If you are looking specifically for high school level books, skip to page seven.
This resource provides a very extensive list of books meant to reach every type of struggling reader. A lot of the books on the list are geared toward engaging boys, but there are also books for both boys and girls, and a few dealing with timely issues like homosexuality. Also included is a Lexile chart and a "Finding Appropriate Books for the Struggling Reader" worksheet.