A dangerous duet

"Nell Hallam lives in a modest corner of Mayfair with her brother Matthew, an inspector at Scotland Yard. A talented pianist, she aspires to attend the Royal Academy; but with tuition beyond their means, Nell sets out to earn the money herself--by playing piano in a popular Soho music hall. She'll have to disguise herself as a man and slip out at night to do it, but spending evenings at the Octavian is like entering an alternate world, one of lively energy, fascinating performers, raucous patrons--and dark secrets. When Nell stumbles upon the operations of an infamous crime ring working in the shadows of the music hall, she is drawn into a conspiracy that stretches the length of London"--Adapted from back cover.