It's one of the most mysterious cases in Canadian history, and one of the most high-profile. A billionaire husband and wife found dead in what at first appeared to be a murder-suicide, but quickly becomes something else. For almost two years, police have been investigating the deaths of the Shermans, and revealing very little about what they've been finding. But a new book by an investigative reporter digs deeper into the hunt for answers in the Sherman case—and we spoke to the author about all the things the police aren't saying, and why we might finally have answers soon. GUEST: Kevin Donovan, author, The Billionaire Murders