I Survived the Black Death, 1348 (I Survived #24)

"Elsie dreams of becoming a brave warrior like her father, who is an archer fighting in England's war against France. But life isn't fair in 1348 Europe. Peasant girls like Elsie can't be archers or knights or anything exciting. Then one day in the forest, Elsie and her best friend Humphrey discover a chest filled with stolen treasures--and a dangerous secret. At last Elsie has a chance to prove that she's as brave as any knight. Little does she know that a deadly illness--the Black Death-- has begun its attack on England. It's already killed millions around the world. And now it's come for Elsie"--