Captain Ed Perrin is facing one of the biggest test of his career in tonight's episode. A year in the planning, he's been given permission to sail his vessel all the way into Stockholm. It may be his greatest achievement if he can complete it however with thousands of tiny islands to avoid and shallow waters, it is a very terrifying task.One hour before her big show, Dulcie is put to the test when injury strikes. To make matters more difficult she has been paired with a new recruit who doesn't know the routine. Elsewhere on the excursions desk Timthy's amobition is about to be put to the test on a trail tour of the rooftops of Stockholm.