Did the Royal Navy's December 12 Killer murder 20 more victims?

Many people have a special day in the calendar that reminds them of some significant event, perhaps joyous or sorrowful. For Allan Grimson it was December 12 - for that was his date with death. Many people have a special day in the calendar that reminds them of some significant event, perhaps joyous or sorrowful. For Allan Grimson it was December 12 - for that was his date with death.