Murder on Black Friday — P.B. Ryan

September 24, 1869. The Gilded Age loses some of its glitter when the gold market crashes, wiping out fortunes and dreams in a matter of minutes. But whip-smart Boston governess Nell Sweeney has found that in the rarefied world of the rich, power and dark secrets go hand in hand ...

When two acquaintances of the Hewitts, Nell's wealthy employers, are found dead on Wall Street's first "Black Friday," most people assume they committed suicide after being financially ruined. Yet upon closer examination, Nell's trusted friend Dr. Will Hewitt suspects that one of the men was actually murdered.

With little more than her Irish wit and indomitable will to guide her, Nell sets out to help Will find the culprit. But as the investigation progresses, the pair discovers that the two men were linked by something more valuable -- and far more treacherous -- than gold ...