Kalypso Media Digital announces plans for an OS X edition of Anna, the horror/adventure game previously released for Windows, saying this will show up on Steam and the iTunes App Store on November 9th. Here's a reminder of what the game involves:

Anna is a first-person horror adventure that explores the darkest depths of the human psyche. Set in an abandoned sawmill nestled high in the mountains, Anna challenges you to uncover horrific clues and use them to solve puzzles related to your character’s dark past. As you play, Anna will change locations and unveil new secrets. The way you play will not only determine the mental health of your main character, but will also lead to one of three possible endings.