Quote from egnor on 28 June 2020, 6:22 am

Hint 1: [spoiler]Don't worry about the RIDDAL dispatch service, just look at key words.[/spoiler]

Hint 2: [spoiler]This puzzle probably should have been flagged as needing external knowledge...[/spoiler]

Hint 3: [spoiler]The all uppercase words are cluing a particular famous work.[/spoiler]