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Irish poet and entertainer Joe Devlin gives charity performances of his one-man show, donating the money to the American Friends of Northern Ireland, an organization that helps the victims of the violence in Northern Ireland. In reality, Devlin uses the proceeds from his shows to buy guns for the terrorists.
While he is arranging one gun purchase, he discovers that his supplier, Vincent Pauley, is planning on taking the money and absconding to Lisbon. Devlin treats Pauley as a traitor to the Irish cause and executes him by shooting him in his hotel room. Although he attempts to remove all evidence of Pauley's connection with Devlin, he forgets to take the copy of Devlin's autobiography that Devlin had autographed for Pauley at a bookshop earlier that day. When Columbo investigates, he discovers the book which puts him onto Devlin as a suspect. However, it proves considerably more difficult to discover enough evidence to place Devlin at the scene of the crime.
The Irish accents are far from convincing, and more closely resemble those from Dublin than Belfast.
When Columbo is playing darts with Devlin in a pub, he needs 66 to win. Of his 3 darts, one hits outside the scoring area, one bounces off the dartboard and the third hits the bullseye which is worth 50. However, Devlin declares Columbo the winner.
When Columbo's car gets a flat tire at the dock, he needs to borrow a dime from Devlin to call a tow truck. However, when he is riding in the tow truck he asks the driver to pull over so he can call in to Devlin's talk show, using a public phone. Columbo has the dime for this call without needing to borrow it.