Love story, tightly plotted thriller, heartbreak hotel: you’ll be sweating bullets and may shed a few tears while reading Ariel Lawhon’s new novel, Flight of Dreams. Lawhon imagines what might have happened on the final, doomed journey of the Hindenburg before it exploded in May of 1937, and she’ll be reading from her engaging new novel tonight at 6:30 at Parnassus! Lawhon takes on one of the great mysteries of the 20th century – why the …