An arrogant detective, Charles Courtney, prides himself on never having committed a single mistake in his long and distinguished career. He keeps a shelf of labeled mementos from each of his cases. On the shelf there is an open space and a blank tag for what Courtney calls "The Perfect Crime". One day a defense lawyer stuns Courtney when he confronts him with evidence that the detective helped convict an innocent man who has since been executed. Courtney kills the lawyer, bakes him in a pottery kiln, and places the vase in the open space on his shelf as a memento to his perfect crime.
A diverse group of tourists on an organized trip to Lisbon find themselves investigating a murder after one of them is killed on the first morning. Set out to find the killer among the group as they visit beautiful Lisbon sites.
