The Darwin and Dickens Conspiracy

The Darwin and Dickens Conspiracy is a downloadable content mission set to appear in Assassin's Creed: Syndicate.

Official synopsis
''Embark on two pulse-quickening missions that will take you into the inner sanctums of London’s most influential men. Defend Charles Darwin’s discoveries from those who would kill to silence him. And help a friend of legendary writer Charles Dickens keep a secret that could get him killed.''

Reference

 * Assassin's Creed: Syndicate official website