Welcome to our Trail of Cthulhu game set in the year 2137. Humanity has established colonies on the Moon and Mars, and exploration of the outer solar system is well underway. Europa, Jupiter's icy moon, has become the location of mankind's most secure detention facility - the ESV Tartarus, a maximum-security prison ship housing the worst criminals from Earth. Our investigators are a team of antiquarian booksellers who have been hired by the Interplanetary Corrections Authority to appraise a collection of rare books discovered in a smuggling operation to the ship.