Really need help here - perl

I need to sum the total of a field IF it meets certain criteria. My database looks a bit like this:

Title (field) Chapter (field) Size (field)
My Life .......... 1 ................ 5
My Life .......... 2 ................10
My Life .......... 3 ................ 8
The Revenge.....1 ..............30
The Suspect.....1 ..............10
The Suspect.....2 ..............20

I need to sum the field "Size" IF the field "Title" is the same story title. But, obviously I don't want to query the actual field value...too many entries. So I have to use variable names like $Title and $Size.

In the example above, my sums should be:
For
  My Life Sum=23
  The Revenge Sum=30
  The Suspect Sum=30

It sounds like it should be easy enough but I've been playing with it for weeks and can't get what I need. Any help would be appreciated.

Thanks,
TheOneRing