In his 1852 novel Basil, Wilkie Collins’ narrator concludes that those ghastly heart-tragedies laid open before me … are not to be written, but … are acted and reacted, scene by scene, year by year, in the secret theatre of home. Taking this memorable quote as her starting point, Jenny Bourne Taylor demonstrates how Victorian psychology is central to an understanding of the complexity and vitality of Collins’ fiction, exploring the boundaries of mind/body, sanity/madness, and consciousness/unconsciousness. Bourne Taylor’s depth of research and thoughtful analysis establishes the importance of Collins as a writer whose fiction challenges the cultural constructions of the nineteenth century, and proves the impossibility of drawing a precise boundary between fictional and psychological codes . Going beyond conventional discussion of the sensation genre, here we see the depth and range of Collins’ writing and gain an understanding of its relation to Victorian medical thought. The study includes close readings of five novels: Basil (1852), The Woman in White (1859-60), No Name (1862-3), Armadale (1864-66), and The Moonstone (1868). Consideration is also given to Man and Wife (1870), The New Magdalen (1872), The Law and the Lady (1875), Jezebel’s Daughter (1879), Heart and Science (1882-3), The Fallen Leaves (1879), and The Legacy of Cain (1889)