Bulletin Board

SPOILER

The fireworks in the video appear to be 4 Red, 2 White, 4 Green, 2 White, 7 White. From the puzzle we have "13124" in different colors. Taking the 1st, 3rd, 1st, 2nd and 4th letters from the firework colors we get RIGHT. Making the clue, "A DEATH CHASE, AM I RIGHT?" Which anagrams to "DAME AGATHA CHRISTIE" with an "H" leftover.

All the pictures match a form of murder in her books:

• Ukulele String 1/8 The Bird with the Broken Wing' (short story in The Mysterious Mr. Quin)
• Marble Clock 1/11/47 "And Then there Were None";
• Apple Bobbing Tub 7/10/17 "Halloween Party"
• Dagger 6/4/16 "Murder on the Orient Express"
• Raincoat Belt 14/13/62 "Three Blind Mice"
• Crowbar 5/39/57 "Witness for the Prosecution"
• Tennis Racquet 3/2/11/7 ("Towards Zero"); "Murder at the Vicarage"
• Golf Club 1/4/6 ("The Murder on the Links")
• Chocolate 9/14/2 "The Chocolate Box"
• Nylon Stocking 1/6/40 "A Pocket Full of Rye"
• Fire 32/28 "The Mysterious Affair at Styles"

The answer is Murder at the Vicarage.