Carpe Diem by Harry Mount
I found it to be entertaining (mostly) and interesting (so that’s why we use that word). Additionally, Mount wrote without pretence and even makes fun of those that use Latin superfluously (those “wankers”). I learned that the V is pronounced like a W (i.e., Weni, Widi, Wici), and was reminded that it was the Rubicon that Caesar crossed as he cast dyes.
A good little book for those interested in the Latin language but would rather learn about it, instead of actually learn it. Paraphrasing Mount, “Many say that learning Latin will help you understand English, but the primary thing learning Latin helps you understand, is Latin.”