The Iron Lady - The Iron Lady, #1

Agatha Freeman is like any ordinary grandmother; caring, fun and selfless.  She will do anything for her grandchildren, MIssy and Jacob.  Anything. When Agatha is looking after her grandchildren, a gunman enters their home and demands the most bizarre things about Agatha's past. Thus begins an adventure which propels them to the Berlin, Germany where she must confront an enemy she thought long dead.