The Italian poet and scholar Francesco Petrarch lived through the most deadly pandemic in recorded history, the Black Death of the 14th century, which saw up to 200 million die from plague across Eurasia and North Africa. Through the unique record of letters and other writings Petrarch left us, Paula Findlen explores how he chronicled, commemorated, and mourned his many loved ones who succumbed, and what he might be able to teach us today.