As Eliza and Blake’s once-fraught relationship begins to evolve, they find that working together may be a tricky prospect. Meanwhile, newlyweds Ivy and Potts adjust to married life, a new detective settles in at Scotland Yard, and Nash causes chaos, even from across the globe. Joining this season’s adventures in his greatly anticipated return is Moses Valentine, who swoops in to help Eliza and her crew, just when they need him most.