When their mother is hospitalized in a car accident, Pim and Putt suddenly discover that they have a set of grandparents they've never known about.

当他们的母亲因车祸住院时，皮姆和普特突然发现他们有一对他们从未知道的祖父母。但一个可怕的真相早已隐藏在他们祖父母家的墙壁内，这个真相通过一个神秘的洞逐渐向 Pim 和 Putt 揭示，让他们的家人毛骨悚然。