Parry was desperately in need of money we all know that. It's obvious Wallace didn't make the call, yet Parry was almost certainly involved somehow...really guys just think about this a little.

Remember Julia was killed bending to light the fireplace...no signs of struggle...so random robbery...no way. It was someone she knew and let in without a fuss, not a random 'Qualtrough' who could count on not being recognized. Just think; if the robbery was pulled off, Julia and William would surely know they 'had been had'. And look to indentify and apprehend Qualtrough.

There are many reasons why an ersatz intellectual like Wallace might want to knock off his elderly, 'intellectually inferior' wife who it seems had lied rather badly about her age. Motive doesn't need to be proved, and it isn't enough to convict to say 'who else would have wanted her dead but him?" but you guys are coming up with the opposite argument. The truth is if we make motive an issue at all, Wallace's motive is the only one that makes any sense in an obvious murder plot.