This book is tiny but insanely dense. If a person reads it in earnest, by the time one reaches the back cover they will know Pāli.

Don't be mistaken. This is a textbook and it is very boring. But it doesn't waste any time teaching you vocabulary and grammar in a systematic way that builds to the totality of the language by the end.

It's pretty neat how Pāli grammar seems to reflect Tamil while the vocabulary reflects Hindi and Sanskrit. I wish I knew one of these languages as a basis for comparison.