The Birds of Summer is Snyder's second book dealing with a singleparent family. The Witches of Worm tells of a young girl often left alone by a mother who spends all of her time with her boyfriends and on vacations. The daughter passes the time by exorcising imaginary witches from her cat. The story is about growing up and reviving old friendships. Most of Snyder's books feature strong female adolescent characters fending for themselves and often bearing responsibility for other family members.