Nicholas Nickleby is Charles Dickens' third published novel. He returned to his favourite publishers and to the format that was considered so successful with The Pickwick Papers. The story first appeared in monthly parts, after which it was issued in one volume. The style is considered to be episodic and humorous, though the second half of the novel becomes more serious and tightly plotted. Dickens began writing 'Nickleby' while still working on Oliver Twist and while the mood is considerably lighter, his depiction of the Yorkshire school run by Wackford Squeers is as moving and influential as those of the workhouse and criminal underclass in Twist.