Cassie Nightingale is a fictional character from the Hallmark Channel movie series known as "The Good Witch." She is portrayed by actress Catherine Bell and is depicted as a kind-hearted and intuitive woman with magical abilities. Cassie runs a charming shop called the Bell, Book & Candle in the fictional town of Middleton, where she sells various mystical items and offers guidance to the townspeople. Throughout the series, Cassie is known for her positive outlook and her ability to help others solve their problems. Her character embodies themes of love, friendship, and community, making her a beloved figure in the Good Witch franchise.