Steve and Liz comes to the aid of an amnesiac struggling to piece together his identity, but they soon discover jogging the newcomer's memory may not be a good idea when they become uncover a shocking case of domestic violence. Meanwhile, Bernie and David are once again left picking up the pieces when Vernon becomes morbid and sets out to make an everlasting impact on the world, whilst Jenny issues Merton a few home truths about the troubles in their marriage.