There's an acrid authenticity to this portrait of the lives of homeless junkies in New York that seeps, pore-deep, into the viewer.

Cautiously recommended.

Lasts 90 minutes, but you could happily spend hours in the dangerous company of Harley.

Such an open-hearted, rawly bellicose realization of addiction has only been graced on celluloid but a handful of times, making the Safdie's film a new exemplar of narcotic cinema for the ages.