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The Doctor stands accused of murder, despite Lady Cranleigh knowing he is innocent. What is the secret she is protecting that allows her to let an innocent man go to jail?
A murder is committed in Cranleigh Hall .The Cranleighs ask the Doctor to play cricket and then join them for a masked ball, enabling the killer to hide in plain sight.
The Doctor lands the Tardis in an underground cavern on 26th century Earth. Then the Doctor, Tegan, Nyssa and Adric become embroiled in the search for a team of missing scientists being preformed by the military.