It's no mystery that she was born in 1890 in Devon, England, wrote 67 novels under this name & 6 as Mary Westmacott
Birthplace: Torquay, Devon, England ... 1976 in Winterbrook House, Chosley, 
Oxfordshire, England ... Dame Agatha Mary Clarissa Christie (born Miller) in 
WikiTree ... She also wrote romance novels under the name Mary Westmacott.