The Plum Tree merges the past and present into a haunting story about the nature of love and loyalty--and the lengths we will go to protect those who need us most.

In the fall of 1918, thirteen-year-old German immigrant Pia Lange longs to be far from Philadelphia's overcrowded slums and the anti-immigrant sentiment that compelled her father to enlist in the U.S. Army. But as her city celebrates the end of war, an even more urgent threat arrives: the Spanish flu. Funeral crepe and quarantine signs appear on doors as victims drop dead in the streets and desperate survivors wear white masks to ward off illness....