I was asked about this in a great sing in the Station, Whitby this week, which is why I'm looking on Mudcat as I only half remember the tale. The original poem was found in the ships log as noted above and 'Thou must not come tonight' is the poem writer, the last man left aboard? trying to persuade the grim reaper, who he sees coming for him, to 'Row On' and not take him. 'Thou must not linger here' echo's the same plea.

John