Soon after Hong Kong was handed back to China by Britain, filmmakers Andrew Lau Wai-keung and Alan Mak embarked on an ambitious project to revitalize a film industry in disarray. The result was the Infernal Affairs trilogy, which has its roots in the HK action movies of the 1980s, using familiar narrative tropes as a springboard for a complex meditation on identity amidst new political and economic uncertainties. Criterion’s three-disk Blu-ray set showcases the trilogy with an array of new and archival extras.