In the Season 10, Episode 6, titled " Return to Sender ," the story centers on Martin and Louisa traveling to London for a medical conference, where Martin is the keynote speaker. This episode is frequently praised by viewers on IMDb for its focused storytelling and the absence of certain subplots, making it one of the season's stronger entries. Plot Overview
: true to the show's formula, Martin manages to diagnose a rare illness and save lives amidst the personal chaos of the trip. [S10E6] Return to Sender
: Louisa faces her own stress when she realizes that Sophie Trent , a woman from Martin's past who has recently divorced, is also attending the conference and seems intent on reconnecting with him. In the Season 10, Episode 6, titled "