The Mystery of Loch Feinn

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Cthulhu Companion

Pages: 8

Author(s): Glenn Rahmann

Artist(s): Chris Marrinan

Setting: 1920s

Appears in: Cthulhu Companion



The rumored existence of a surviving Plesiosaurus has drawn famed professor Willard Gibbson to Scotland. But before he can gain conclusive proof, he is found murdered. Will the investigators succeed in solving both the murder and the puzzle of the beast?


Spoilers - Keepers Eyes Only

Players should not read any further.


The party are drawn in following the murder of Professor Gibbson, either as old friends, to investigate the murder, or to follow up on the Professor's research. They may be recruited by his daughter or by the British museum.

The Professor has found a number of interesting megaliths, and been observing the Loch. However, the powerful MacAllan clan were obstructing his work and threatening him. He became concerned by some of what he learned, particularly cryptic hints dropped by a drunken MacAllan, and concealed his journal shortly before his murder. The MacAllans have a history of strange dabbling, and the town has many legends of a Water Horse, which has been blamed for many missing animals and people.

The MacAllan clan are, in fact, cultists of a lloigor colony under the ruins of an old castle. They are helping the lloigor to extend their psychic influence by restoring the standing stones. To foil the plot, either the stones must be destroyed or the MacAllans elminated.


Player Handouts: None

Locations: Loch Feinn (near Inverness in Scotland)

Creatures: Lloigor, MacAllen cultists

Tomes and Artifacts: Unaussprechlichen Kulten (a suggested reference, but not found in the scenario itself)

Campaigns / Scenarios: None, but could be tied into Shadows Over Scotland scenarios, notably Heed The Kraken's Call.


List dedication, trivia, images, anything else of note.

Keeper Comments

There are no stats for many of the NPC enemies.

There is a very nasty 'trap' in the ruined castle, in the form of a mirror that summons an image of Ghatanothoa. There's no warning in the scenario, or any way for Investigators to work out what it does, and they might naturally assume it's relevant to the plot and try to use it. In fact, it's not plot-relevant at all. Keepers may want to reconsider this element, since it's extremely powerful, and could distract Investigators away from the actual plot.

The investigation could usefully be fleshed out. The information available is somewhat vague: Investigators should soon realise that there's something to do with 'dragons', and that the megaliths are involved, but learning what the MacAllans are up is tricky. Their clan rituals are very occasional, and they're quick to murder nosy people. Investigating the ruins is likely to attract a lloigor, with its instant-kill attack; the scenario emphasises that the victim probably doesn't realise their danger until it's too late. As written, the scenario seems to rely on Investigators simply deciding to destroy the stones, rather than trying to learn what's actually going on. If not, violence will quickly escalate, and they may find it difficult to achieve anything with both lloigor and MacAllans on the watch.