Ep 6. Mile Marker 14

A mysterious new figure arrives in Southold, sending Jo and Chris on a hunt to uncover the identity of the stranger. Meanwhile, Alex confronts a long-absent embezzler to determine his intentions and Mia makes a drastic decision on behalf of the hive mind. But their investigative efforts are set back when a rogue dog scratches a child at the scene of the crime, causing a dangerous outbreak. As the doctors and CDC rush to contain the infection, Piper's powers manifest in unforeseen ways. With the threat of a deadly virus looming, Jo makes a crucial decision about her daughter's future, while Chris contemplates a choice between science and his family. All the while, the stranger watches from afar, biding their time.