The Larsen kids expected to be outside on Saturday, but the rainstorm had other plans. Now they are stuck in the basement, killing time with video games and designing future tools for the woods — which is the kind of thing that happens when you keep a group of siblings bored and unsupervised long enough. When the youngest, Jeeson, insists he saw a ghost in his bedroom, the eldest decide a prank is in order. Chaos follows, as it tends to do when siblings devise plans for each other.