The 10 questions we need answered in the Line of Duty finale Ahead of Sunday's finale, these are the queries keeping us – and the Gaffer – up at night What does the series finale hold in store? Credit: Steffan Hill After last week's high-speed car chase and a gripping interview scene we now know what "runs of homozygosity" are and just how bent (or not) Joanne Davidson is. But there's still much to be revealed in Sunday's finale. There are the question that must be answered. 1. What’s under the workshop floor? Something, surely, that will crack the case – but what? Kate Fleming and Steve Arnott clocked that the machinery found in the OCG’s gun workshop was too heavy for two men to lift. So why did the OCG send a pair of goons there once they thought they coast was clear? Well, some heavy tools in their van suggested they were about to do some digging. Send in the GPR! That’s ground-penetrating radar, to you and me. The weapon that killed Gail Vella? Incriminating evidence against high-ranking police officers? Bodies? Whatever lurks under that concrete, surely, will lead to H.