Young Wash and Titch dodge capture, uncovering allies, threats, and truths about Titch's family; in Halifax, Tanna's plan backfires, straining ties with Wash and Goff; as Wash's aquarium impresses, danger tests loyalty and ambition.

Wash urges Medwin to fight for love, then joins Tanna and Goff in London; at the Royal Science League, betrayals surface and a reunion at the Wilde estate unveils a powerful truth about Wash's past.