Something strange in the night

There's been something strange happening at the house next door to us over the last week or so. Most evenings, as soon as it starts to get dark, they start digging! It's a bit creepy and although we've tried to peek over the fence to see what they are doing, all I can see is a man with a shovel but not what he is doing!

The house is a halfway house where young people who have carried out minor offences or have just lost their way for some reason are rehabilitated and taught "life lessons", how to cook and generally look after themselves. We don't have much trouble from them, occasionally some noise and when spirits are running high, they can jump from their fire escape onto our roof. But this digging has got us bemused!

If the police come knocking on our door about a mising person I'll at least know where to send them!