Hook brings ailing David with him to find the sextant that may help them decipher a map that shows the way out of Neverland; Killian Jones and his brother sail off to find a plant in an uncharted land.
A surprise visit from Hook's brother Liam may provide Hook and Emma with the tool they need to defeat Hades; in flashbacks, the bond between the Jones brothers is tested as their merchant ship heads into a storm.