Margaret convinces Lucille to host a dinner to celebrate Jacob's return, but unexpected guests strain relations in the Langston family to the breaking point. Meanwhile, Bellamy continues to research the history of the mysterious bones, and Rachael receives unsettling news about her baby.

Bellamy, now desperately ill himself, turns to an unexpected source, his shadowy government contact for help and ends up with a shocking revelation about his past. And after another returned disappears into thin air like Caleb Richards, the living look for answers. A newcomer to Arcadia makes Henry a tantalizing offer.