The promise of Promise is the potential pharmaceuticals in its vast rainforest. Field botanist Westerly is sure something about the life cycle of the "common blueflower" that grows beneath the vast epiphyte known as "broadvine" has been missed. She gets a very strange warning, then an even odder message. When her best friend, Ross Baron, gets her careful reply, he drops the life and career he'd been building. Shulo does what he can to prepare for them to be running. And then there were three. What was coming that they what they became would be needed?