A perplexed Inspector Peacock summons Holmes and Watson to the home of Miss Lucy Grendle, to investigate a murder seemingly committed by an invisible perpetrator. Miss Lucy Grendle has a problem with vodka... and Sherlock Holmes. Their paths have crossed before and it did not end well. Tension is in the air and it is not just because a murderous Invisible Thing is prowling the house. As the night unfolds, amidst a lethal concoction of a cadaver, origami and alcohol... Sherlock Holmes finally meets his match.