Although Jeremy told Mary Mugford that June is a religious maniac, he would never try to pin the crime on her. Sheila was much more likely.
Colin Caffell said Jeremy was very interested in Sheila's health situation soon before the night & asked when Sheila was next staying at the farm.
Is this somehow meant to imply that therefore Jeremy was planning a murder spree ?
So a bloke enquires about the health of his sister in a chat with his brother in law and this leads you to believe ... what?
Are you also aware that on being told the news of Sheila's spree, when it was believed by all that Sheila was responsible, that Colin was not surprised and said words to the effect that "she's finally done it" ?