The book opens not with Wilhelm but with the actress Mariana and her shrewd old servant Barbara, who is angling to keep a rich merchant in the picture while the young Wilhelm Meister courts her with his whole heart. Wilhelm, son of a prosperous trading family, has loved the theatre since a childhood Christmas when a puppet show first opened a magic world to him. He believes Mariana loves him as he loves her, and he plans to abandon commerce for the stage and for her.
That first love collapses, and a stunned Wilhelm tries to return to ordinary business. But travel and chance throw him among a struggling troupe of actors, and the old passion revives. Along the way he takes in two figures who haunt the whole novel: Mignon, a strange androgynous child he rescues from a brutal rope-dancer, and a wandering old Harper burdened by a secret grief. Mignon's song of a sunlit southern land and the Harper's ballads sound a deeper, sadder note beneath the comings and goings of the players.
Wilhelm rises among the actors and stakes everything on a grand staging of Hamlet, working out a careful reading of the prince as a fine but overburdened soul, an oak-tree planted in too small a vessel. The production succeeds, yet the theatrical life around him stays shabby, vain, and unstable. Bit by bit Wilhelm senses that the stage will not give him the self-cultivation he hoped for, and that he has been drifting more than choosing.
Unknown to him, his wanderings have been watched. A quiet network of thoughtful people, the Society of the Tower, has been observing and steering his path. Their mysterious certificate of apprenticeship turns out to be a record of his own life, written so that he can see himself from outside. Their teacher, the abbe, holds that people grow through doing, not through being preached at, and that a guide should aid every honest tendency of nature rather than force a single mold.
In the final movement Wilhelm is drawn into the circle of the Tower and toward Natalia, a serene and generous woman, while the secrets around Mignon and the Harper come to their sorrowful close. He learns that the boy Felix is truly his own son, and the abbe greets him with the words that name the whole book: his apprenticeship is done, and nature has pronounced him free. He gains, almost without deserving it, both a settled love and a sense of vocation, like a man who set out to find lost asses and found a kingdom instead.