After inheriting their grandmothers precious doll collection, two bickering sisters visit the estate, but find themselves trapped and tormented by dolls manipulated by a demonic entity and must escape .

The logline positions the inheritance as the inciting event, but it’s really the first instance of a possessed doll attacking them. Also, the goal of escaping leaves the demons in question at large. Perhaps they need to rid the house of the demon for good to save their own lives.

My try:
After a possessed doll collection attacks them in their dead grandmother’s house, two bickering sisters must banish the demons to save themselves.

Though I would typically recommend a single protagonist plot, in this instance, I think the character dynamic of bickering sisters works.