This is a very quick introduction to the word order of the Japanese language before we jump into the Harry Potter book.
Japanese is typologically classified as an SOV (Subject + Oject + Verb) language, whereas English is classified as SVO.
(Mr. Smith is studying Japanese in Japan.)
The Location and Direct Object can be switched, but the Subject (topic) and the Verb must normally be in sentence-initial and sentence-final positions, respectively.
I suggest you to buy this dictionary as it offers comprehensive discussion and a lot of examples on Japanese grammar.
Or you can look around for an online copy for a quick peek of the book.