The detailed story of unusual love in lonely castle! I don't understand. Everybody help.

The story goes like this: Laura grew up in an orphanage. On the day she was adopted, she and her five friends were still playing the game of "wooden head". After Laura left, the other five children were playing with Thomas, the deformed son of the administrator, and naughty left Thomas alone in the cave by the sea. As a result, the sea rose and Thomas drowned. Five children were not punished because they were too young. Because of hatred, Thomas's mother killed five children and bagged their bodies and hid them in a hole in the wall of the hut (specifically, how she killed them was poisoned by the administrator, and she avenged her son Thomas. When the protagonist in the film watches the video, there is a scene of eating dessert in the picture, which should be poisoning everyone. And the ghost of the child has been wandering and crying in this building. Many years later, Laura returned to the orphanage with her husband and adopted son Simon. This is no longer an orphanage, but Laura wants to rebuild on a small scale and continue to raise 5 or 6 orphans. Simon is a child with HIV. Generally speaking, his life may be short. It is because he is going to die soon that he can see the ghosts of those children (according to the later "psychic" theory), become friends with them (first Thomas in the seaside cave, then five children in the building), and know the secret passage in the storage room under the stairs and Thomas's cabin. Laura and her husband didn't take Simon's nonsense seriously. Thomas's mother learned that the orphanage was going to be rebuilt, found Simon's information and pretended to be a social worker to ask for information. In order to destroy the criminal evidence, she came to the hut with a shovel at night. As a result, Laura was awakened by the sound of hitting the wooden door on the hole in the wall. Laura found out and fled in a hurry, but the badge on her collar was left next to the hole in the wall. Simon plays the game of hidden treasure with five children. The children hid his money in Laura's drawer to hide Simon's life and case. Simon learned about himself from documents and Thomas. He played games with his mother and followed the clues of treasure hunting until he opened the drawer, suggesting that her mother already knew everything. After his mother was still evasive and didn't tell him the truth, he told the truth out loud. Mom and dad talked to Simon to reassure him, but Simon began to doubt their love. The party will start before the orphanage starts to adopt children. Simon watched the other children come to his house by the window, and he was a little lost at the thought that they might share their mother's love. At this time, his mother came in and asked him to go downstairs to meet the guests, but Simon preferred his mother to accompany him, so he strongly urged her to go to see Thomas's Cabin with him first. Simon's request seems to Laura to be importunate, because everything around her is busy. In desperation, Laura was surprised herself and slapped Simon. Simon covered his face and his eyes were full of resentment. Mother left him and went downstairs to entertain the guests. Simon went to Thomas' cabin and changed into Thomas' clothes and potato bag hood. Laura didn't trust Simon, so she went upstairs to find him. Simon appeared in front of his mother in Thomas' clothes. He couldn't forgive her, so he pushed her down, locked the door and hid in Thomas' cabin. Dad pried open bathroom door, and Laura rushed out, regardless of her own injury, looking for Simon everywhere in the house. She found the storeroom under the stairs, but did not find the secret passage on the wall. Instead, she piled the iron frame on the door of the secret passage. Simon in the secret passage was trapped and couldn't get out. Laura ran to the seaside cave where Simon had been and saw Simon standing at the mouth of the cave that was immediately flooded by the tide. But in fact, this is her illusion. Her husband didn't see anything and the police didn't find Simon in the cave. In the evening, Laura, who suffered from insomnia, heard some strange noises. Just as she looked into the room through the crack of the door, there was a heavy muffled sound (the stairs of the secret passage broke and Simon fell dead). Laura found a doll in the crib (actually representing herself, a clue to find Simon). Thomas's mother died in a car accident. Laura found out from her photos and videos that it was "Thomas" who pushed herself down that day (in fact, Simon was wearing Thomas' clothes). Laura and her husband found a "psychic", and the result of hypnosis surprised everyone present. They heard the child crying. The light was too dim for the psychic to find Simon, but the psychic told Laura: You are a great mother. As long as you believe, you can see (the psychic once opened her sleeve and covered her arm with scars, which she said was the result of dealing with death). Laura began to believe in ghosts according to the tips of "psychic" She tried to talk to them, hoping to find Simon. A window behind him suddenly fell down, and the glass broke on the stool next to the window. The first clue appeared: there are five dolls in the box (Laura's five little friends, with obvious characteristics: lame, blind, braces and so on). According to the clues, Laura has found photos, roses, cloth strips, ice cream packaging, Simon's box, and a door handle (actually a secret door handle). Laura took the doorknob and looked around, looking for the clue it represented. She came to the hut in the yard, but accidentally found the badge left by Thomas' mother there, and then found the bones of five children in the hole in the wall. The truth that the children were killed by Thomas' mother finally came out. The husband couldn't stand the strangeness of this house any longer and left. Laura persisted for two days and continued to look for Simon. When she was a child, she rearranged the house, erected a scarecrow, rang the doorbell and met her childhood partner. In the evening, Laura tried to play the game of "wooden head" in the room. A few words later, five children appeared one after another. Laura chased 1' s children all the way to the storage room under the stairs, and finally found the last clue represented by the door handle, the secret passage and Simon. In the past, Laura found that there was only a piece of cloth in her arms, and "Thomas" was lying on the ground not far away, with broken stairs on it. Laura unmasked Thomas. Under the mask, she searched for her son Simon, who had been trapped in the secret room for nine months, and he slipped and died. Laura, desperate and self-blaming, sat at the window of the orphan dormitory with Simon's body in her arms, tore off the amulet that her husband "borrowed" for her ("give it back to me when you find Simon") and committed suicide by taking medicine. Outside the window, Laura watched herself leave her childhood under the aura of a distant lighthouse. Looking back, Simon and five other friends all looked at her with smiles. The door opened and Thomas came in wearing a mask. In another world, the world of ghosts, Laura, who has grown up, takes care of her seven children who will never grow up and lives happily. ...