(Translated) From the publisher website
Skull & Bones is a RPG in the dark and fantastic world of world war I.
Europe is at war, dragging the world into the first planetary conflict. The situation is the work of a group of conspirators acting in the shadow from Germany, a secret society named "Skull & Bones". The conjured aim at imposing a their grip on the old continent, then all across the Earth. Their mean are way beyond the common mortals: they inherited ancestral secrets to practice a sorcery allowing them to invoke, enslave and exploits daemons !
Skull & Bones invite to play a group of adventurers fighting against Skull & Bones, the Doctors. Each Doctor has be recruited by a mentor, member of the Multitude, another occult faction, inspired by a 17th century secret brotherhood : Dog, an officer-priest of the French army, Baker, a high ranking French army officer. King, a chief in British Intelligence, Sugar, a German esoterist and Able, a Japanese diplomat posted in London.