What did Harper know and when did he stop knowing it?

Coming awfully close now, isn't it?
Wright didn't just dash off a cheque to Duffy in a moment of sentimental weakness, to dry Duffy's tears on a sad February day.
Harper's chief of staff actually went through a negotiation with Harper's former legal counsel to give Harper's best media buddy a legal deal for $90K:

Prime Minister Stephen Harper’s former special counsel and legal adviser worked on the legal deal between Nigel Wright and Sen. Mike Duffy’s lawyer that called for Wright to help Duffy pay off $90,000 in invalid expense claims, CTV News has learned.

But none of them told Harper anything about it.  Oh, sure.
Despite Perrin's carefully phrased denial, I just don't believe Harper's sanctimonious Sgt. Schultz 'I know nothing NOTHING' defense, and neither does anyone else.
Canadian Press reports on what happened today during Question Period:

"They think we're fools," said Francoise Boivin of the NDP. "They're trying to make us believe that (Harper) knew nothing."
Complained New Democrat Nathan Cullen: "These guys will not be accountable."
Charlie Angus, the New Democrat who has been worrying at the issue since it began, called it "abuse of the public trust."
The government "has lost its moral compass," boomed Liberal Leader Justin Trudeau. "The prime minister is in this up to his neck."
Liberal colleague Ralph Goodale called it "an insidious scheme."
Through it all, Baird maintained an uncharacteristic calm, glancing periodically at his notes and insisting Harper only knew of the payment to Duffy when it became public last week.
The minister, who can be a vitriolic opponent, never raised his voice. "I can't be any more clear," he said repeatedly.