This may be the first US hard cover edition, but the spelling and punctuation appear to have been preserved, and it's printed on such lovely white paper!
Also, Phryne is awesome:
'Miss Phryne Fisher. Investigations. 221B, The Esplanade, St Kilda,' read Bunji. 'You becoming a private Dick, eh? What larks! And what luck about the address.'
'It wasn't luck, I just added a B to 221. I bought the house for the number.'