Now I'm wide awake, and a little weirded out. I don't think the police are taking this case seriously. It's suspicious to say the least. Let's examine the evidence:

a) Rose the goat gave birth to a son during her marriage to Charles Tombe, but apparently 'not a human one'
b) This would suggest that Rose committed adultery with another goat during her marriage, which resulted in the birth of the kid.
c) This betrayal, coupled with the fact that Charles was forced to marry Rose as a punishment, would provide a pretty good motive for murder.
d) Rose is thought to have choked to death on a plastic bag she found in the street. Choked, or had it rammed down her bleating throat by a drunken, resentful husband who couldn't bear to spend one more night with his cheating wife?