Who could resist a wager from London's most popular detective, Sherlock Holmes? Certainly not his scientist neighbor, Elise Hamblin.

The challenge: Study the primal nature of men; but not just any man for her study will do. Sherlock has chosen the Earl of March, a man with a scandalous and dangerous reputation.

Prospero Harrington has returned from exile to claim the title of Earl of March and his late father's mounting debts. Desperate to secure his future, he responds to an intriguing ad and finds himself the subject of observation by a beautiful woman in exchange for a hefty payment.

Disguised as a man, Elise follows Prospero about London. Their close proximity and adventures provides a fascinating introduction to the world of men, passion, and desire.