In Anna Katherine Green's mystery novel 'The Millionaire Baby,' six-year-old Gwendolen Ocumpaugh disappears while napping in her backyard tent, and her mother suspects she's drowned in the nearby river. Despite a city-wide search and a $55,000 reward, no one can find the missing child. Mr. Trevitt, however, suspects something is amiss and takes a different approach to the investigation, uncovering numerous suspects along the way. Will he be able to solve the case and find the millionaire baby before it's too late? Readers will be on the edge of their seats as the thrilling mystery unfolds.