I Capture the Castle, by Dodie Smith

I loved this book! It had me laughing out loud and reading into the wee hours of the night (11:30 pm). It was first published in 1949 and is written by a British author, so there are words like "boot" instead of "trunk." It's a fun read.

Here is the synopsis from Amazon.com:

I Capture the Castle tells the story of seventeen-year-old Cassandra and her family, who live in not-so-genteel poverty in a ramshackle old English castle. Here she strives, over six turbulent months, to hone her writing skills. She fills three notebooks with sharply funny yet poignant entries. Her journals candidly chronicle the great changes that take place within the castle's walls, and her own first descent into love. By the time she pens her final entry, she has "captured the castle"--and the heart of the reader--in one of literature's most enchanting entertainments.