Kalaziel is a terrible guardian angel: her temper's shorter than she is, she swears, she's missing a wing, and she sees no problem with letting man make their own choices-no matter how questionable. That's what free will is all about, right? Her overseers disagree. After she mishandles an assignment, Heaven strips Kala of her title and throws her back into training, hoping to reinforce the covenant of vows she swore to uphold as a guardian. But the angels' motives aren't as pure as they appear: they want to eradicate any opinions that conflict with Heaven's code. With a mass cleansing on the horizon, Kala discovers she is not alone in her insubordination; there are other angels who are restless with the stasis of Heaven and ready for change. Progress doesn't come easily, though, especially when it means uniting ancient enemies to fight for a common cause. "Engage is a novella that prequels Kala and Ana's story in Incite."