Can you recommend me a children's science fiction adventure novel?

When I was young, I read novels in about 2000. It was a set of books, but I only bought one of them. I forgot the title long ago. Recently, I suddenly recalled the content and missed it a little. I suddenly wanted to find it I don't remember the content of the novel clearly. I only remember that it was a book with a few short stories. The descriptions were all in the first person, and one of the stories seemed to be about a little girl who went to her grandma during the summer vacation. But there was a black cat there, and that black cat wanted to harm the protagonist. The protagonist kept trying to kill the black cat, and every time he thought it was dead, it would appear again? Maybe it was because cats had nine lives? I remember that there was once when the main character was at the swimming pool and the black cat almost caused the main character to drown. Fortunately, his companion saved the main character. I really can't remember the details... There was also a story about the male protagonist, Rain, who was a young reporter from a newspaper. He specialized in studying birds. One day, when he was doing his research outdoors, it seemed to have rained? Then he went back, but he, he suddenly realized that there was a house on the corner of the street, but he had never seen anyone come out from there, so he went to reveal something He realized that the person was Rainan…I only came out on rainy days, and the protagonist entered this house. I still remember that the protagonist found a person hidden in the mirror, and that person was the real master. Rainy took the place of the master, and the protagonist wanted to save him. Unexpectedly, Rainy found out and locked the protagonist in the mirror... What can of sardines? There were also a few novels in the book that I really can't remember clearly. I only remember that this novel scared me when I was in primary school. The most important thing I remember is that the adults in the novel didn't believe what the children said and thought that they were being naughty. Every time the protagonist was very helpless, it left a big shadow on me because the feeling of being treated as a lie was really terrible! Speaking of which, was this really for children to see? I can still clearly remember the words written on it! Children's literature! Ahhh