The Wide Window

The third book in the Series of Unfortunate Events, "The Wide Window" has the three Baudelaire orphans going to live with their Aunt Josephine on the shore of Lake Lachrymose. Poor Aunt Josephine is terrified of everything, and life with her is pretty miserable, but at least they're safe from Count Olaf.
Sadly, not for long. Count Olaf shows up in disguise as Captain Sham, who runs a sailboat rental business. He charms Aunt Josephine, despite the orphans warnings (they see through his disguise right away, of course) and ends up forcing her to write a suicide note leaving the children in his care. Josephine cleverly plants clues in the note that Klaus deciphers and the children find her hiding in the Curdled Cave, bravely risking their lives in a hurricane to reach her. Sadly, they are stranded out in the middle of the lake when Count Olaf rescues them, throwing poor Aunt Josephine out to be eaten by the infamous leeches. Mr. Poe shows up just in time to make a bumbling mess of everything, and the kids are once again left without a home.