BBC 4 has a new psychological thriller set on an ocean voyage. “Mike is a carpenter, a boat builder, and a keen amateur sailor. Now, in his 60s he feels the time has come for a big adventure, so he signs on as crew for a transatlantic sailing voyage. But when the skipper turns to tyranny and his only ally on board loses touch with reality, Mike is faced with his own demons.

There’s no storm, no shipwreck, no sea monster – only three men trapped together, each battling for their own sanity.

With only the endless sea surrounding them, Mike soon realises he is the only one who can pull the crew and himself out of a very dangerous place. Will he surrender to the dark line that runs through all of us?”

Listen here.