Theory:

The poem "The Shed" is written by Frank Flynn. It talks about how the speaker wishes to visit a shed in his garden. However, it is not easy as the shed looks haunted.
 
Characters:
  1. The speaker (presumably a young boy) - the central character
  2. The speaker's brother - a minor character
 
Apart from the characters, the shed becomes a crucial motif as the entire poem revolves around it.