Context

The Victorian context of Jekyll and Hyde: respectability and reputation among gentlemen, Darwin and fears of degeneration,
science and religion, Stevenson's Edinburgh and Deacon Brodie, late-Victorian London, and the Gothic.
How to use this context in an answer about the novella rather than as background.
Victorian respectability: gentlemen, reputation and hidden vice, and the professional men of the novella.
Darwin's On the Origin of Species and fears of degeneration, and Hyde's 'ape-like' violence.
Stevenson's Edinburgh, Deacon Brodie's double life, and Stevenson's Calvinist upbringing.
Science and religion in the 1880s, and the Gothic novella or 'shilling shocker'.

What you need to know