[TOMT][MOVIE][90s-00s] Thriller movie where a guy is trying to track down a girl he loves and he ends up meeting her brother

This is not the main plot of the movie, but something that happens at the second half. I'm not sure what this movie was about, but all I can remember is that this main character encounters a brother of his lover, who is some kind of writer or a scientist, who is in a wheelchair. I remember there is a scene in brother's house which is full of sunlight and the room is filled with books.