Brick

Brendan Frye is a loner, someone who knows all the angles but has chosen to stay on the outside. When the girl he loves turns up dead, he is determined to find the "who" and "why" and plunges into the dark and dangerous social strata of rich girl Laura, intimidating Tug, drug-addled Dode, seductive Kara, and the ominous Pin. (official distributor synopsis)