During a surprise visit by Araya's grandparents, Dylan and Lu disagree over what to do after a promising new drug for Parkinson's disease begins exhibiting problems.
Present: A mentally disabled man seeks Rene's help when the state threatens to separate him from his aunt and place him in an institution. M.E. faces the severity of Alzheimer's disease when her father arrives for a visit. Past: Port Dixie is invaded by Rene and M.E.'s new high school friends.
The team searches for a serial bomber whose latest pipe bomb maimed the wrong target and whose three previous bombings — in 1999, 2001 and 2003 — collectively blinded a man and killed two others.
The team reopens the 1998 case of a murdered teenage girl after her father is arrested for savagely beating the teen's stepsister, who is just 3 years old.
After new evidence — a substantial splatter of the blood of a popular deaf boy who went missing in 2006 — is discovered in a storage room at the high school for the deaf the teen attended, the team attempts to find the boy's body and killer.
Lilly and Valens head to West Virginia to retrieve a primary suspect for the 2007 presumed homicide of a young woman abducted from the parking lot outside her engagement party.
"Catherine and Father search for a way to find Vincent."
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