Pathfinder Adventure Path: Life’s Long Shadows - Rules of Play says:

"Life's Long Shadows" is a Pathfinder adventure for four 9th–level characters. This adventure, from author Greg A. Vaughan, continues the Extinction Curse Adventure Path, a six–part, monthly campaign in which the heroes lead a traveling circus as they unravel a plot to eradicate all life from the islands of the Inner Sea. This adventure also includes information about the bountiful area known as the Swardlands and the malevolent demon lord Zevgavizeb, as well as new monsters and rules.