Murdoch Mysteries 3x13

Murdoch is called upon to investigate an exceedingly strange murder. The deceased was found inside a room locked from within with no other entrance. But there's more to the case than that – the victim appears to have exploded and burned, yet there is no trace of an explosion or fire. Before Murdoch can proceed with his investigation, the case takes a bizarre turn when old friend and world-renowned inventor Nikola Tesla appears, announcing cryptically that he is "too late."