While investigating a series of bank robberies, Olivia, Walter and Peter are shocked to find one of the suspects inexplicably trapped inside a vault wall as if it solidified around him. Walter realizes that the high-tech thieves have figured out a way to defy the law of physics and that, much to his dismay, the crooks are after something of his. As the ongoing investigation unfolds and the mystery deepens, the perilous situation climaxes when a member of the trio is ambushed.