Things get too close for comfort when Addison, Pete and Sam must come together on a complicated case involving a dad-to-be who comes down with tuberculosis and threatens the future of his new family. Addison meets Sam's new girlfriend, Vanessa. Meanwhile, with Violet still gone on her Costa Rican escape with Cooper, Sheldon takes over helping one of her patients, Natasha, to get over her crippling fear of flying, and he asks Charlotte for advice. Cooper comes back from the Costa Rican trip early and finds himself in a "zen" state, but his zen soon disappears after walking in on Charlotte and Sheldon kissing. Naomi finds herself in a bit of a love triangle of her own.