Answering a call for help from a neighboring group of settlers, the heroes embark on a rescue mission that takes them to a hidden jungle valley, where alien dinosaurs prowl among ancient elven ruins. The trail leads through a magical portal to an abandoned Azlanti base on the world's moon. Whispers of the Eclipse is a Starfinder Roleplaying Game adventure for four 5th-level characters that continues the Horizons of the Vast Adventure Path.