Remember the story of Harold Holt's disappearance? It was pretty dramatic at the time and a remarkable way to lose a Prime Minister. Either swept out to sea, or maybe to a foreign submarine? Eh?
Anyway, 58 Cavendish, Stanmore, is reputedly his birthplace. Which is pretty close to where I grew up in Marrickville. The parallels end there, I suspect.
And yes, Holt St intersects with Cavendish. There's a clue there, surely.