The FBI arrives in Southold, complicating Jo’s efforts to find Emily. Meanwhile, Alex and Piper hunt for answers on a road trip, and the family celebrates Mia’s birthday.

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.

After months of dead ends, the Evans family receives information that could finally lead them to Piper; Ed helps Mia as she tries to send Piper a message; Alex and Chris stumble upon a mysterious shipment in the harbor.

Jo and Brooks assemble an unlikely team as they attempt to communicate with Piper. Meanwhile, Piper is intent on saving Benny from Helen’s mysterious mission, and Alex receives a life-changing offer.

Jo makes a high-stakes deal to take down Helen and keep Piper safe. Meanwhile, Helen attempts to replicate Piper’s powers for herself, and Benny struggles to earn back Jo’s trust before it’s too late.

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.