The Wandering Soul Murders (2001) on Netflix

Plot summary

Joanne Kilbourn once worked as a detective. Her husband Ian, Ontario's attorney general, was murdered six years ago, and the case went unsolved. She now lectures in criminology and speaks about criminal matters on local television. When the file is reopened, police arrest Kevin Tarpley, who denies killing Ian but appears to hold inside knowledge of the death. A sniper shoots him in the street before investigators can press him further. At a party attended by Ian's former cabinet colleagues, among them Gary Hargrave, Tess Malone and former premier Howard Downey, Kevin's wife, Maureen Gault, confronts Joanne. Against the wishes of Inspector Philip Millard, her former partner and the officer leading the case, Joanne starts asking questions of her own.