Long Way Down by Jason Reynolds, 305 pages.
Reynolds is a fascinating writer and his book length poem about a boy seeking to avenge the death of his brother is sad, moving and skillfully written. Will knows where his brother Shawn kept his gun. After Shawn's death, Will retrieves the pistol and boards the elevator to go out and seek his brother's killer. At each floor, as the elevator descends, Will is visited by someone from his past. I listened to the audio version of this book which is also narrated by the author. Really an excellent book (or audio).
One of the books I bought for teen gifts this past Christmas.