While the scandalous truth about Claire's real father is revealed, her adoptive mother faces a crisis. Matt takes a job as a bodyguard for a crooked attorney, which puts him in the crosshairs of Linderman's new assassin. Hiro and Ando return to Las Vegas to find the sword, but get sidetracked by a damsel in distress. Suresh finds someone on the list and unknowingly puts himself in grave danger. Meanwhile, Simone turns to some unlikely help in her and Nathan's struggle to find Peter.

H.R.G.'s past catches up to him as Matt and Ted Sprague, come to Texas looking for answers, and take him, his wife, son and Claire hostage -- leading to a tragic, explosive showdown. Secrets are revealed and new threats to the "heroes" are introduced.