Gabe Phillips announces he's prepared to sell his successful comic strip for $10,000 and moving to Majorca to concentrate on real art. One of the cartoonists, Pete Manders, is offered the chance to buy it and invites Perry Mason and Della Street to a farewell party Phillips is having to finalize the deal. Perry wonders why Phillips would be willing to sell his cartoon strip for one-tenth of its value, but it becomes somewhat clearer when its revealed that Manders' girlfriend, Leslie Lawrence, is leaving him for Phillips. Perry also has concerns about the ownership of the cartoon strip plus Phillips receives a call forcing him to leave before the deal can be finalized. Manders doesn't take the news very well and, in front of all the party-goers, says he will kill him and hits him before he leaves. When Phillips is killed, Pete Manders is charged with murder. It turns out Phillips may have been living under a different identity and Perry must determine which one was killed.
—garykmcd