'My wife! I think she's dead!' Matt frantically calls to park rangers, explaining that he and his wife, Marie, were out hiking when she stumbled on a cliff edge and fell into the raging river below. They start a search but aren't hopeful: no one could have survived that fall. It's a tragic accident. But when police discover Matt's first wife also died in suspicious circumstances - a fire in their family home - they have a lot more questions for him. Is Matt a grieving husband, or has he just killed his second wife? Detectives Loren and Spengler dig into the couple's lives to see what they can unearth. And they find that love's got teeth, it's got claws, and once it hitches you to a person, it's tough to rip yourself free. So what happens when you're done making it work?