Deadly Gamble: The First Charlie Parker Mystery, Honeymoons Can Be Murder: The Sixth Charlie Parker Mystery, Reunions Can Be Murder: The Seventh Charlie Parker Mystery and Stardom Can Be Murder: Charlie Parker Mystery #12. Right now (2/13/12) Amazon is offering them for free. I have no idea how long this deal will last (prices on Amazon can change at any moment). The price will be $0.00 if it is still free.
Prices change all of the time. Double check the price before making a purchasing decision.