The Catacombs of Seville

September 1973. The fledgling UNIT has had a busy summer and now Brigadier Lethbridge-Stewart finds himself leaned on by the British Government to assist the Spanish army in an investigation, couched as a training exercise in Seville. Major Branwell steps up to the mark, with Corporals Benton and Tracy for support. But it seems that almost everyone has something to hide - even the dead.