Deep in the meadow

15. That’s the main thing; it represents two things in my life: my brother’s unknown death, at the age of 15, and this riddle:

'Small green goblins, a speck of white,
When a white bird calls on shepherds' delight.
A turn of 15, a fleck of scales,
Blue white red feather tails.'

I don't know what it means or why it’s there, but what I know, is that somehow they are linked. Somehow they fit in together like a puzzle, and if that puzzle is not put together, I may be in danger, my life, and those left in my family at risk. Well that’s what he told me.