A woman who has just escaped from her abusive husband and moved to an old apartment must defend her autistic child from an evil entity which he accidentally released after befriending the neighbor, a mysterious old man who claims to be a renowned magician.

There seems to be no direct cause and effect between the abusive husband and the rest of the story. Maybe I'm missing something, but it looks like that part can be cut from the logline. The inciting event seems to be the entity appearing for the first time. Is there a specific event in which the entity first does something to the boy?

There is a strong hint of The Babadook in this.

Why is it important for us to know that she's just come out of an abusive marriage? A mother's instinct to protect her child will be there regardless. Why is the child autistic? Personally, I don't feel like the story would change all that much if it was simply "When her mysterious neighbour releases an evil spirit into her new apartment, a overprotective introvert must discover the entity's weakness in order to defeat it and protect her child".?

The other problem is that, surely, the real antagonist is the magician next door, not the entity that's released. Even once the entity has been destroyed, he's still being creepy and mysterious next door? In your head, he might not be the antagonist but he's a loose end for sure. I want to know what his involvement is through the rest of the story.

"When her mysterious neighbor releases an evil spirit into her new apartment, a woman just getting out of an abusive marriage must discover the entities weakness in order to defeat the being and protect her Autistic child"