Even though Rebecca is cured, her best friend Ernest the microbe will stay nearby to help protect her from a nasty flu virus that wants to spread around her school.

"Rebecca is spending time in the country with her father, and Ernest of course, when things begin to change. Rebecca befriends a boy who is her age, and she sees her sister leave to return to the city on her own. Will Ernest & Rebecca's friendship survive?" -- from publisher's web site.