The average human being can survive three minutes without air, three hours in extreme heat or cold, three days without drinkable water and three weeks without food.

These rules are worth taking to heart - I know for a fact they're true.

As long as you don't break them, you'd be amazed how long you can keep a person alive, bringing them back from the brink just before they succumb to the death they plead you for every day.

But I have one more rule to add.

If you're careful to make sure you don't leave fingerprints, choose your victims wisely, and maintain the outward appearance of a quiet but polite neighbour with a steady job and a well kept home, you can live at least 3 decades without anyone suspecting a thing.