利用基因改造的蝗虫从美国中西部一处高度机密的研究机构中逃脱了，它们展开一场舐血的疯狂食人之战。一群专家开始想办法扑灭这些蝗虫，再晚一步，若是蝗虫的声势与数量持续扩大，恐怕无人能幸免。

In I'll Be Watching, after her tech genius husband (Bob Morley) leaves on a work trip, Julie (Eliza Taylor), still mourning the loss of her sister, is trapped in their new, isolated home and must fight her own fears to stay alive.