Release Message:  A robbery suspect is found embedded in a wall, causing Walter (John Noble) to realize they have not only found a way to literally walk through walls, but are looking for something he's made in the past.

Description:  After a series of mysterious bank robberies, a suspect is found embedded in a wall, causing Walter to realize that they have not only found a way to literally walk through walls, but are looking for something he's made in the past. (Walter tells of his machine)