What is the invited reading of the novel and what technqiues does Markus Zusack use to postion readers to accept this reading?

I really enjoy this book, and everything by Marcus Zusak. 
This book is whimsical, and a perfect example of what is known as
suspension of disbelief.  In other words, you are invited
to accept the account you read as real, no matter how bizarre it gets.  Suspension of
disbelief is a wink and a nod agreement between the author and reader.  We know that the
story line is implausible, but we also know we are in for a great ride if we ignore that
fact.

So, yes, it is pretty unbelievable to accept that a
taxi driver is getting playing cards with secret messages with heroic tasks, not to
mention actually succeeding in those tasks.  At the end, if we play along, we realize
that the taxi driver, Ed, is not the messenger but the message and the author, Marcus
Zusak, is the messenger.

It’s a brilliant and unusual
book.  If you want to read Zusak’s masterpiece, pick up The Book
Thief sometime.