With his condition now stabilized courtesy of the Insitute's cure, Mr. Hyde seems to have emerged as the dominant personality. He has however retained some of Tom's memories which come back to him in a flood. His memories also flashback to 1886 Edinburgh, where we see Dr. Jekyll meeting his fiend Robert Louis Stevenson who has written a fictional tale based on his experiences. Stevenson has also correctly guessed the nature of Jekyll's secret 'potion' which is revealed to the modern day Mr. Hyde. Claire is surprised when Hyde proposes something completely unexpected.
—garykmcd