Madeline, smallest and naughtiest of the twelve little charges of Miss Clavel, wakes up one night with an attack of appendicitis. Can a scaredy mouse like Geronimo survive the year's most terrifying holiday? Candied cheese treats! It was Halloween, the spookiest day of the year. And it seemed like everyone was out to play tricks on me, Geronimo Stilton. Things went from bad to worse when my nephew Benjamin dragged me to a graveyard to do research...

A deadly, flu-like epidemic and a plague of flesh-eating creatures threaten the lives of the children at Perdido Beach while Sam, Astrid, Caine, and Diana each struggle with doubts and uncertainties.

Felix feels bad and does not want to eat or play, so his mother takes him to Doctor Duck, who makes everything better.

When all five Romero children get sick, a magical cat appears in the night and cures them of their fevers.

When Sam has a cough, Mrs. Bear tends to him all through the cold night.

When Boy is sick, his friends Dog and Bird try to help him feel better.

When Louise wakes up with itchy eyes, a wheezy throat, and a sneezy nose, she just knows it is not going to be a very good day.

Madeline, smallest and naughtiest of the twelve little charges of Miss Clavel, wakes up one night with an attack of appendicitis.

Katie misses school while she is home with the flu.

Having spent several years in and out of hospitals for a life-threatening illness, pragmatic sixteen-year-old Cam is relocated by her miracle-seeking mother to a town in Maine known for its mystical healing qualities.