When Robyn Loxley's life is turned upside down by a police shooting, she turns to her friends, from underground rappers to daring outlaws, to save her mother's life from John Prince and the Sheriff.

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.