If you take a poll of a large number of foreign language learners regarding which language seems the most difficult to learn, most of them will say that either Mandarin Chinese or Polish seems daunting. When it comes to Polish, their choice is probably driven by the fact that the spelling and pronunciation rules seem challenging at first, and look unfamiliar to eyes that are used to English orthography and pronunciation.
However, when you go beneath the surface, and explore the Polish language more deeply, you will find a very logical system, one that combines logical grammar and pronunciation rules with a vocabulary that draws from many related languages, and that shares its word base with many nearby tongues that it has unfluenced over the centuries.
Polish is awesome, and this book will help you build up a very strong vocabulary base in this language - one that increases in importance at a global level every single day, as the country and the diaspora increase in power, wealth, and influence.