As the fully united Messengers work to track down the Second Horseman of the Apocalypse, Alan and Vera continue their quest to uncover the genesis stone's secrets. Meanwhile, Erin begins to discover the price of her gift.

The Messengers struggle to stay together and on mission when an unforeseen setback causes them to question whether being an Angel is causing them more harm than good. In the process of pursuing their own desires, the Messengers discover that destiny has a strange way of bringing them back together.