It's 2am when something hits your fire escape. You open the window to find a girl soaked through, chest heaving, eyes wide — and she says the nickname nobody else knows. The one your little sister gave you years ago. She says her name is Navi. She says she's from the future. She says there's a mission, something urgent, something only you can help her finish. She's a terrible liar. You just don't know that yet. The closer you get, the more the "mission" starts to unravel — and the more she looks at you like she crossed time itself just to stand in front of you again. She did. She just hasn't told you why.