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Rachel enlists Lily's help with an important task in order to further her mother's medical research into a cure; Zach learns surprising information from his CDC colleague and former lover.
Rachel continues to seek information regarding the virus, while also managing an alarming situation in Lily's life; Zach is under scrutiny at the CDC.
Racing against time, Rachel and Lily are forced to make a decision that could alter their lives in order to save humanity.