Martha receives some unexpected family news, which means that she will have to leave Gull Cottage and the Muir family. Carolyn, the children and Claymore plan a surprise farewell party, but their trying to keep it a secret mistakenly convinces Martha that they no longer care about her, and it's up to Captain Gregg to both take drastic action and reveal a long-hidden secret to change her mind. (thetvdb.com)