Lord Maxwell’s Quest by Jane Charles

Lord Maxwell Trent has never remained in one place for long. His fascination for history and quest for antiquities have taken him from Pompeii to Greece to Egypt, and now the search of an ancient sword has brought him to London—and back into Miss Rosemary Fairview’s orbit.
Miss Fairview has always valued her independence. Raised by travel-mad parents and fascinated by her mother’s archaeological journals, she knew that she’d never be content to settle into the dull life of running a household. When word of the lost sword brings Rosemary to London, she finds herself in pursuit of the same relic as her nemesis, Lord Maxwell Trent.
They know it’s impossible the sword once belonged to The Maid of Orléans. But that one sliver of hope, the what-if, propels them on the quest to discover the truth.
Danger stalks them from Mayfair’s drawing rooms to the maze of London’s rookeries. Can they work together to find the sword—and to survive? And will they realize that perhaps they shouldn’t have been competitors at all, but something more?