Emma Milne and Joe Inglis's wedding day arrives and the reception party aboard a river boat goes on late into the night. But for Trude Mostue and Sam Robinson it is just another working day. Trude is having to operate on a hamster - a tricky task on such a small creature. Its seven-year-old owner has perfect faith in Trude's powers. Equally stressed is Sam, in Hull, who has to perform a difficult operation on a very valuable, but hoarse, horse.