a heavenly call

[eli7]

I want to say that a message was heard through the sky and I want to use the word "call" for it. Now I want to know if it needs an article or not.(contable or uncountable)

"The knife was sharp but it didn't work! Then a heavenly call was heard that there is no need to sacrifice your..."

 

[Egmont]

"Call" is countable. It requires an article, as you wrote in your sentence.

 

[eli7]

Thank you Egmont.