Spangled to Death - White House Dollhouse Mystery series, #1

Spangled to Death is a completed cozy mystery. My character, Liv Anderson, owns the White House Dollhouse store in Minneapolis, and has a doctorate in American history, specializing in the First Ladies. A department store owner from New York City stops at Liv's store to purchase dollhouses for further retail. Liv finds her dead the following morning in her store. Before her death, she asks Liv about the 'family secret'.
What is the 'family secret'? Liv searches family records, letters, and photos, and finds that clues surround her, and realizes that she's searching for the Star Spangled Banner manuscript. Liv stands between the manuscript and the killer, who will find it first?