There is a family who went to a house for the weekend. The wife and three kids went to that house first, the husband doesn't come on Saturday because of work. He says he will come after the work. The younger seems so attached to his father in that story.
After some time, the younger kid made a friend in those woods who eats literally anything.
And the house they came was a house of scientist, who discovered plant species/ organized the species.
Though I don't remember, that scientist attains immortality or like that and he went to another world. That scientist has a daughter who is now quite an old woman.
And there is makeshift villain who is after something that scientist found, but that he didn't get during scientist time, so he is waiting for his time. The scientist secured the perimeter of house with some kind of plants.
I don't remember how story goes on but in the climax, the younger kid got the book and climbs the house. And the villain transforms into some kind of monster and chaseq the kid. The kid with plan of his friend (woods), drops the book and the villain in attempt to catch the book transforms into a bird/crow... He catches the book and flees the scene but only caught by kid's friend, surprisingly. He ate the villain in that form. And the movie ends.