A police chief who takes in a young child she finds near the site of a mysterious accident who has no memory of what has happened.

Jo and Chris must evade the FBI as they investigate an elusive group of cyber terrorists. Ed’s presented with a cancer treatment that seems too good to be true, and a mysterious woman’s attempt to reach Piper puts the entire Evans family in danger.

In the season finale, Jo and Brooks are in danger, and Piper’s determined to help. With Helen’s mysterious plan nearly realized, Piper recruits an unexpected team of allies to find them before it’s too late.