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Mary and Marshall suspect that a new witness may be involved in a string of murders and the stabbing of Mary's friend. The pair try to determine if the witness is truly the killer before another victim surfaces.
After the engineer of a collapsed bridge is targeted by the families of those who died in the accident, he enters WITSEC and tries to prove he's not responsible for the collapse.
Brandi is charged with murder and drug trafficking by Agt. O'Connor, leaving Mary to try to uncover the reasons behind his vendetta against her sister.