Murder to music

Agatha Christie's "Swan Song" stars Mme. Paula Nazorkoff, the quintessential diva, and Edward D. Hoch's "The Spy Who Went to the Opera" takes undercover agent Jeffrey Rand backstage. Lynne Barrett goes on the road with a colorful Elvis impersonator, while in "The Family Rose" Charlotte Hinger spotlights a fading country-western singer. On a different note, John Lutz's private eye Nudger trails a blues singer through the jazz clubs of New Orleans, and Doug Allyn's gumshoe. Tracks down a record company's unpaid royalties - both with fatal results.