In St Agnes, the crew is involved in a race against time to rescue two young men. They are reported to be struggling in the water near a notorious headland known as Tubby's Head. In Whitby, North Yorkshire, Leah is training to be the station's first female helm, and her skills are put to the test when she is called out to rescue a walker who's fallen and injured her leg on inaccessible rocks by the seal colony at Ravenscar.