After her brother is gunned down by a notorious Hispanic gang, a young woman grows up to become an undercover detective and infiltrates the deadly gang to bring them to justice.

Revenge is a dish, best served cold

No worries Will, I am happy to have you take a stab at this. That is what this site is all about.

Good comments. The reason I included "grows up" is to establish that this has been a life long mission for this woman, who saw her brother gunned down when she was just a child. Like they say, revenge is better served cold. They say that right?

Or how about : A (maybe put an adjective here) female detective goes undercover to infiltrate the gang that brutally murdered her brother. Sorry, I don't meant to be writing your loglines, so ignore it if it encroaches on your writing too much.