lerning a secret crazy language: Finnish

who still wants to tell me that Finnish language is not crazy (=who really understands the different between the following examples??):
Luen kirjaa. – I read a book (at the moment or only part of it)
Luen kirjan. – I read a book. (the whole book… or the plan to read the whole book)
Luen kirjat. – I read all books. (or whatever… I’m not sure what they mean…)