Gyles Brandreth's Oscar Wilde series has just been published in the US. Whereas the UK title was Oscar Wilde and the Candlelight Murders the US title is Oscar Wilde and a Death of No Importance.
You can read an excerpt from book 1 at the Simon and Schuster site.
The second book in the series also suffers the same fate. Due out in May, the UK title is Oscar Wilde and the Ring of Death and in September, the same book will come out in the US as Oscar Wilde and a Game Called Murder.
I really can't see why the titles need to be changed, both pairs of titles seem equally 'cozy'.