Halloween Bingo - Fear the Drowning Deep

Danger! -  Arthur Conan Doyle

I was planning to read John Langam's The Fisherman for this square but I think I am done with the horror genre for a while. I'm just not in the frame of mind for it. 

So, I was delighted when TA pointed me to a story by Arthur Conan Doyle earlier today that also works for this square.