They arranged a plan to throw suspicion on John Cavendish, by buying strychnine at the village chemist's, and signing the register in his hand-writing. 
The village chemist sells strychnine and has a register.
The strychine was not purchased in John Cavendish's name.
You'll make a mistake at some point.
The setsubun festival happens in the middle of the summer.
The dog listens to it's owner.
Three cheerleaders are performing a trick.
The underpinning will be your undoing.
We send it off to be ground and it changes colors.