The exitement starts straight in the beginning of the book, where Violet, Klaus and Sunny Baudelaire go to a general store to send a telegram to Mr.Poe. However, no answer is coming and soon they must escape with a VFD car to the Heimlich Hospital. They get a job in the Heimlich Hospital archival library where they find a page from the mysterious Snicket file.
Klaus and Sunny try to save somebody named Laura V. Bleediotie from a suspicious person called Mattathias. It turns out that the Baudelaires have encountered him before! I found this book very enjoyable and amazing, so if you like to read a book with an (very)unhappy end this is what you are looking for.
Even my father who hasn't read any other books of "A Series of Unfortunate Events" liked this! "The Hostile Hospital" is great!