Do you believe that there is a passage leading to another world in a corner of your home? But don't crawl in. After the little girl Caroline moved into her new home, she felt bored by the shabby and lifeless environment. Boring and old-fashioned parents, weird neighbors, a nasty little boy and his black cat, such a life is simply killing her with a head full of fantastic ideas. But things are not always so bad. One night, she actually found a secret passage behind the 13th door of her home. Caroline, who likes excitement and adventure, certainly will not give up the opportunity to explore it, so she slowly crawled along the passage. Caroline found that the other side of the passage was a world that was exactly the same as the reality but different. Everything seemed to be copied here now, but her dreams were realized here. What made Caroline happy the most was that the mother in this world was kind and obedient to her. But later, she found that this "ghost mother" was going to replace her with button eyes and keep her in this "wonderful" world forever. Caroline found herself in great danger and she had to find a way to escape from the clutches of the "ghost mother".