Streets of Glass — Michelle Davidson Argyle

Eighteen year-old Starry is destined to take over her father's powerful drug syndicate. But when she finds out he has kept her only sister a secret from her, she can't trust him anymore. Furious, Starry vows to find Emma, even though she knows her defiance could lead to losing the position she's worked so hard to inherit. But Emma isn't quite the sister Starry hoped for. She's a straight-laced good girl who wants nothing more than to take down the syndicate that destroyed her family. Starry, willing to do anything to secure her place in the syndicate, accepts her father's ultimatum to kill Emma and everyone helping her. But the more Starry gets to know Emma, and the more secrets she uncovers, the more she questions whether the price of saving the syndicate is too high -- even for someone as cold-blooded and vicious as Starry.