Belle of the Cabal (The Phoebus Affair, Book 1‪)‬

When his adored Lady Clarissa is ensnared by a demon, London gentleman Nicholas 'Phoebus' Piercey tries to save her, only to be plunged 200 years into the future, where chivalry is obsolete. Immortal now, Clarissa claims him for her master, but cannot kill him. Phoebus's old-fashioned principles have reawakened her heart, but can she ever defy the demon who has stolen her soul?