Shadow People — Joyce McDonald

Gabriel, Lydia, Alex, and Hollis are four totally different teenagers who were thrown together by accident. Or maybe they were destined to meet, for they all share emotions that unite them -- loneliness, frustration,
and anger. Apart they are ordinary enough, unremarkable and not much noticed. Together, in the dark of night, they are drawn to violence like moths to a flame. Gem is a girl whose path crosses theirs when she falls in love with Gabriel. Will the whirlpool of destruction swallow her, too?