Early detective fiction’s anxious obsession with constructing a respectable canonical lineage ensured that texts in the genre are typically both explicit and repetitive in their intertextual referencing, and early detective fiction stories tend to link themselves back to a fairly limited set of precursor texts and tropes. This chapter argues that the automaton became one of detective fiction’s central recurring symbols in the Victorian period, a contested figure lying at the heart of a struggle over the genre and the worldview that it contained.