A high-society garden party at a remote estate takes a grotesque turn when a swarm of monstrous wasps invades the event. These mutated insects, which grow to enormous sizes, hatch from non-descript larvae found in the surrounding area. As they begin attacking the guests, what starts as a serene summer evening descends into pandemonium and horror. Two of the catering staff, the carefree Paul and the more serious Julia, find themselves at the center of the chaos, forced to cooperate and fight for survival amid the escalating onslaught.

Initially unarmed and desperate, Paul and Julia scramble for weapons and shelter while trying to protect the remaining guests. The massive insects prove to be relentless and exceptionally deadly, compounding the group's panic and disarray. Teaming up with the beleaguered host of the party, they navigate through the estate, repurposing whatever they can find into weapons and defenses. The situation continues to deteriorate as the true nature of the threat is revealed, leading to a series of horrifying discoveries and high-stakes confrontations. In their struggle to stay alive, Paul and Julia's resolve is tested while uncovering something far more sinister behind the monstrous invasion.