The novel is titled after the three witches from Shakespeare's Macbeth often referred to as the weird sisters who play a pivotal role in the play's supernatural elements. Dowling's use of this title suggests that the novel may incorporate elements of mystery magic or the supernatural possibly intertwined with romance and adventure. Dowling's writing style typical of Victorian-era literature likely features elaborate descriptions intricate character development and a focus on moral and social themes. The Weird Sisters series would probably explore the lives and interactions of its characters delving into their relationships ambitions and the challenges they face.