When Evil Lurks (original title: Cuando acecha la maldad) is a 2023 Argentine-American horror film that delivers relentless, atmospheric terror. Directed by Demián Rugna, the film follows brothers Pedro and Jimmy in a remote village who discover their neighbor is a 'rotting'—a demon-infected man on the verge of giving birth to absolute evil. Their well-intentioned but disastrous decision to move the body instead of following proper, fearful protocols triggers an unstoppable chain of supernatural violence and possession that spreads through their community like a plague.

The film stands out for its grim, uncompromising vision and masterful building of dread. It operates on its own disturbing internal logic where traditional religious symbols offer no protection, creating a uniquely hopeless atmosphere. The performances, particularly by Ezequiel Rodríguez and Demián Salomón as the brothers, ground the escalating nightmare in palpable desperation and familial tension. Rugna's direction is confident and brutal, favoring unsettling practical effects and bleak rural landscapes over jump scares.

Viewers should watch When Evil Lurks for its raw, innovative approach to possession horror. It's a film that gets under your skin by presenting evil not as a metaphorical force, but as a visceral, contagious reality with brutal rules. The 99-minute runtime is a tense, unforgiving descent into chaos that has earned praise for reinvigorating folk horror with a distinctly South American perspective. It's a must-watch for horror fans seeking something genuinely disturbing and conceptually bold beyond mainstream offerings.