Alan Ladd is back as Dan Holiday, writer and solver of mysteries in Box 13. Holiday hires himself out as an adventurer - all to get story ideas - with a tantalizing classified ad offering to "go anyplace, do anything." We'll hear the big screen star in a trio of syndicated old time radio adventures: "Actor's Alibi," "The Dowager and Dan Holiday," and "Last Will and Nursery Rhyme,"