Fire and Dust by James Gardner - Free

Someone is blowing up the headquarters of factions in Sigil. As part of a multi-faction team, Britlin Cavendish (artist, swordsman, and Sensate) gets drafted to stake out the Mortuary and keep an eye out for trouble. One fire bomb later, Britlin and his companions are fighting wights that don't obey the Death Pact, on a trail that leads from the Plane of Dust to Carceri, Plague-Mort, and many strange places in between.