After stealing Prince's car and saving her mother from the Sheriff, Robyn hopes the worst is behind her, until the Sheriff shows up in Sherwood under an umbrella of surveillance drones, using them to identify suspects and lock down the community.

Robyn and her friends prepare for Lionheart Day, a festival honoring Sherwood's fallen leader and Little John's mentor; just as Robyn hopes for a return to normal life, Lionheart's killer, the infamous Guy Gisbourne, returns from prison.

When John Prince bribes a pharmaceutical magnate to cut off Sherwood's medical supplies, he threatens Tressie's delicate health and drives Robyn and The Hood to a daring heist.