When a demonic book is brought into a college couple home, the couple must find the source of there internal struggles before they become its next victim.
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Where screenwriters learn the form and logline their screen ideas.
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Let me try a logline example, obviously, yours would be different because I don't know all the details of your story.
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"When a Quarreling couple come into possession of a demonic book that feeds off anger, the two must solve their issues before their volatile relationship empowers the evil tome to devour their souls"
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The story, of course, being a metaphor for how a bad relationship can eat your very soul.
I like the premise and can see some of the scenes already, but trying to steer away from Star Trek references:
"An academic couple's dark secrets attract the even darker energy of an ancient book lurking in the college library, and the unwitting pair must resolve their past before the book swallows their very existence."
I refer to "Day of the Dove" (1968), a classic Star Trek episode that strikes many chords.
I am not sure how the two ideas presented in your logline connect, How does solving relationship problems stop a demon-possessed book? There doesn't seem to be any hint in your logline on how those two things connect.
As an example, If there is a magic ring that is the power base for an evil sorcerer, I understand how throwing the ring in a volcano would be a valid goal, because the volcano would melt the ring and destroy the power base. And by that same logic, if you said the couple must throw the evil book into a volcano I would understand how that would stop the book.
But if the couple resolved their relationship problems wouldn't the evil demon-possessed book still be a problem? How does the couple solving their relationship problems destroy the book?