Jane Porter, a young and ambitious executive, works for Gault Capital, a powerful and prestigious company. One evening, after learning about some damaging company secrets that her boss wants to keep hidden, she becomes a target. She gets trapped in the company's high-rise building by Frank, a ruthless hitman dispatched to silence her. With her back against the wall, Jane must use her wits and limited resources inside the building to survive.

Meanwhile, as the hitman stalks her through the empty offices, Jane uncovers more disturbing truths and begins to realize that the conspiracy is more extensive than she initially believed. As the chase intensifies, it becomes a deadly game of cat-and-mouse. Jane is forced to navigate both physical and psychological obstacles, leading her to an ultimate confrontation where her survival instincts are put to the test.