If Tolstoy zoned out to heroin addict films, he’d opine that all happy junkies are alike, and every unhappy junky, too. There’s limited flexibility in powerful pharmaceuticals as smack ascends through its predestined roles from wingman to boss to executioner. Here, in director Neil Armfield’s adaptation of Luke Davies’ novel, said victims are a glamorously mussed couple, Dan and Candy (Heath Ledger and Abbie Cornish) who find smack makes the full bloom of infatuation even rosier. Playing metaphorically on their over the moon joyride, they first appear on a gyroscopic carnival ride, feet floating, limbs entangled, Heath’s nose buried in Abbie’s sugar blonde hair, as their dealer (Geoffrey Rush) smiles grandfatherly. Sadly, Heath corrupts his princess and nods off during their black wedding—the bride’s mother (a rich Noni Hazlehurst) weeps real tears and it’s guaranteed chaos before you can say "prostitution!," "pregnancy!" or "madness!,” all plot points prophesied by the giggling ladies next to me. Davies has no new insights into the heroin spiral, but this silly melodrama benefits from the palpable chemistry between Ledger and Cornish, two solid, sexy actors with grimy vulnerability, and a crackup scene where Ledger tries to get off the hook of hooking by insisting that he’d "be hopeless with the gay stuff."