Fic Set in Cornwall

[sunray45.livejournal.com]

I think the Lads have been having a very bad few weeks, and Cowley sends them down to Cornwall to investigate the death of one of his friends. This friend has been doing some detective work. I know it involves Mt. St. Michael(?), if I've remembered its name correctly.

Anyone remember this? I'd be very grateful, as it has been bugging me for a week now.