Pathfinder Adventure Path: Last Watch (Tyrant's Grasp 3 of 6)

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"Disaster Looms Over Vigil. The heroes race to the crusaders in Vigil to warn them of the Whispering Tyrant's devastating new weapon. Amid a city-wide celebration, Vigil's leaders are disinclined to believe incredible tales from the frontier, so the heroes must uncover the conspirators who seek to engineer the city's destruction. At the center of these schemes is a gang of thieves whose long-ago heist has finally brought old enemies to light. Will the heroes assemble the clues in time to warn others of the doom that hangs over Vigil?"--Amazon.com