The Clathermonts

"Letters in and out of the city are routinely read. But one does not often intimately search a gentleman, and never a lady. So, the rumour has it, Clathermont and his three glum-faced tattooists - triplets, who some say are his daughters - although some hint at a more intimate relationship - hm - where was I? Ah yes. The rumour has it, spies come to Clathermont's to have messages tattooed in less public areas of their skin. This has, of course, been responsible for a scandalous vogue for secret tattoos."

Clathermont himself, as seen in SS.

Clathermont and his tattoo parlor, which is in the vicinity of Ladybones Road, are featured in both Fallen London and Sunless Sea. If you progress far enough in both games, you'll find that one of his tattooists/triplet daughters/lovers, Millicent, has founded her own tattoo parlor.

In FL, you may get any number of small Great Game-related tattoos at Mr. Clathermont's parlor, provided you have enough connections to the Great Game and a high enough Watchful skill. During the Feast of the Exceptional Rose, you can let Millicent give you a tattoo if you have become sufficiently entwined in the family's intrigue and happen to have unlocked a subject for the tattoo.

A tattoo from Clathermont's - a secret symbol of the Great Game.