My experience of burglar alarms and similar security measures is that the fewer people have a key and the password, the better. I like that old maxim about secrets: three can keep one if two of them are dead. Besides, Brittany the cleaner may be a saint, but the verdict is still out on that; until she's proven herself utterly trustworthy, you want to be on the ground when she's in the house.

Yeah, I know. I'm a suspicious old biddy. My house hasn't been robbed in 30 years, so I guess it's working.