Cas is excited to finally go to camp with his best friend the summer before their senior year, but the activities Balthazar’s been talking up—most of which aren’t necessarily camp sanctioned—are forgotten when they meet a boy who looks exactly like Cas. Twins separated at birth when their parents split up, Cas and Jimmy decide to trade places after camp.
They’re hoping to pull it off long enough that each of them can get to know their second parent a little; and once they’re discovered, they’ll make it clear they won’t be kept out of each other’s lives again. For Jimmy, there’s the added bonus of getting to meet his favorite author. For Cas, growing up with only a father who did his best but until recently could charitably be described as a mostly functional alcoholic, going to live with not only his mother but also her wife and stepsons might finally show him what it feels like to be part of a family.
An already complicated scenario worsens when Cas develops a crush on Jimmy’s older stepbrother Dean—who seems confused by the small ways ‘Jimmy’ changed at camp, and unsettled when he starts to feel things he never has before.
An argument with Dean spurs a recently fallen Cas to prove he can be useful as a human by finding his own hunt. But when he’s taken by the unknown creature he’s hunting, Sam and Dean have to race to his rescue. Only it turns out this monster feeds on secrets, and the secrets Cas has been keeping may be too deeply hidden for him to be saved.
When a mysterious blight devastates the kingdom of Celestine's farms, it allies with its neighbor through a trade treaty: Americana will send food north, and Celestine will send its youngest prince Castiel south to wed the American heir, Dean. It's not love at first sight, but that turns out to be the least of their worries. From culture shock and misunderstandings to conspiracies and assassination attempts, the two princes have a lot to overcome before they can try for a happily ever after.