Craig Vandervelt, handsome son of the richest man in America is begged by his cousin, the Marquis of Lansdowne, the British Foreign Secretary, to undertake a secret mission in the most flamboyant principality in Europe – Monte Carlo. Intrigued by the fact that one of Britain’s top agents in India, the reclusive but respected Randall Sare, has disappeared without a trace, Craig agrees once more to use his playboy status as a mask to find out what is really happening. Craig is also told to beware of a beautiful Russian Countess suspected of being a spy.