Murdoch Mysteries (2008)

S3E13 The Tesla Effect

Murdoch is summoned to look into a baffling murder case. The victim was discovered in a room that was locked from the inside, with no other way in. The situation is even more perplexing, as the body seems to have exploded and charred, yet there's no evidence of any explosion or fire. Just as Murdoch begins to delve deeper into the mystery, the case takes an unexpected twist when his old acquaintance and famed inventor Nikola Tesla arrives, cryptically stating that he is "too late."