The stories of Superintendent Grant a senior British policeman in Bombay in the 1930's and his cases. The first book is on a serial killer of young girls getting murdered as they alighted from their trains at their home stations.
The serial killer starts to build a cricket score of victims and Superintendent Grant travels to Madrid and Nazi Germany to apprehend this merciless killer.
Justice is done eventually as he is arrested but the gathering war clouds still affect the decisions made.