该剧以少年犯管教所为背景，将探讨关押青少年的影响以及对照顾他们的人的影响。

 Jack (48), has been married to Maggie (48), for over half his life. He works as a hand raker on the mussel beds in North Wales alongside his younger brother, Dyfan (43) and Dyfan's three sons. Jack has always assumed that his own boy, Tom (15), will join the family business on leaving school but Tom's disclosure that he has no desire to follow in his father's footsteps creates familial tension. Tensions are intensified by the arrival of an itinerant skipper, Daniel (30), who makes known his feelings for Jack. In this remote, rural community where life revolves around Church and fishery, Jack is faced with an impossible dilemma. On The Sea is a beautiful, sensual and at times, tragic exploration of masculinity, place and desire.

该剧以少年犯管教所为背景，将探讨关押青少年的影响以及对照顾他们的人的影响。