In 2013, Canadian college student Elisa Lam disappeared while on a solo trip through California. For weeks law enforcement was at a loss to explain the disappearance -- until, that is, a maintenance worker at the Cecil Hotel discovered her body in a water tank. And with that, what should have been the end of a tragic tale instead became the prologue to a mystery that, according to many, remains unsolved in the present day: What happened to Elisa Lam?