Serpent in the Fold is an adventure for characters of 3rd or 4th level, and is the second adventure in the four-page Serpent Amphora Cycle, following the free intro scenario. From the publisher:

Something stirs in the land of Vesh something unwholesome. A relic of Mormos destruction has been brought into the care of the Vigils, though not without sacrifice. The servants of the Hag Queen will stop at nothing to get it back and the only ones who stand between them and the Serpent Amphora are your adventurers! Are they up to the challenge?