The Regatta Mystery – 1946, Avon First Printing. Double Sin – 1964, First Dell Printing. Murder on the Links – 1959, First Dell Printing. The Murder Finger – 1972, First Dell Printing. Easy to Kill – 1971, 15th Printing.

I could not find any new copies for this book for under $150 on the internet. The seal is only broken on one spot. Extremely rare condition. This book goes for $30 in Acceptable Condition on ThriftBooks.com