The Lost Letter by Jillian Cantor

     Two stories intertwine over an unopened letter and an unusual stamp.  Story one unfolds in contemporary LA.  Katie Nelson's life is not going well but she can at least make good on a promise to care for her failing father's stamp collection.  Included in the collection she takes to philatelist Benjamin Grossman to be evaluated is the an opened letter.  It will lead the two of them on a search across Europe and into their own life histories. 
    Story two happens in Nazi occupied Austria.  Young Kristoff becomes an apprentice to Frederick Faber, printer.  Faber and his family, including his determined daughter Elena, are willing to do anything to oppose the terror that has destroyed his country.  A tiny edelweiss hidden in a stamp becomes a message to the resistance, a bridge across decades and a link between the two stories.  I love happy endings and the link to real events makes this one even better.