The police believed it and so do I. Not far fetched at all. The only trouble is no one seems to be able to accept the plain evidence before them? It points to Sheila what ever state she was found in. IF the police reveal what was really found that day then possibly the fact that Sheila did it may not seem too far fetched? The great difficulty is that they have witheld so much evidence from what was truly found at the scene that day and the other problem is that the evidence they have released simply does not add up. The question we ought to be asking is "What did the police REALLY find that say?"
But Lugg, if we leave aside for a moment what the police may, or not have done we are still left with Sheila's life, from adolescence at least, being an accident waiting to happen. There was, and remains no proof other than speculative, that Jeremy was in any way implicated. A bit of a Hooray Henry but no sign of any disturbance, no criminal record, although many would like him to have, no violent outbursts unless we consider it true that he tried to strangle rats. With Sheila, however, there is a strong balance of possibilities(borrowed from Steve, working for me

)making her culpable and she was set on that path many years before it became necessary to call the police.