In the second case recorded by Benjamin Franklin's young charge and assistant Nick Handy, the great Doctor Franklin is confronted with a shocking event. While attending a mummers' play at the home of a popular merchant Roddy Fairbrass on Christmas Eve 1757, their host suddenly collapses and dies. Although the bereaved family denies it, Franklin is convinced that he has witnessed a murder. Franklin had been to the Fairbrass home one time before to investigate the report of a ghost and now believes that there must be some sinister connection between the two events. Determined to uncover the truth, the intrepid inventor and statesman, accompanied by Nick, unravels a tangled plot of intrigue and scandal while matching wits with some of London's most notorious criminal minds.