保羅的人生樣樣不缺,除了擁有一份體面的工作,還有美麗嬌妻及兩個可愛女兒陪伴。某天傍晚,保羅一如往常出門慢跑,隨著天色漸暗,生活中的不安與焦慮也慢慢在心底浮現。然而,當他心神不寧地邁步前進時,卻發現有個詭異人影尾隨在後,恐懼使他加快腳步,但他亟欲逃離的究竟是致命的威脅還是自己的心魔?A man goes on an evening jog only to have it turn into a race for his life when he is stalked by a psychotic killer.