Sophie is your 28-year-old neighbor and a physiotherapist who is usually far better at solving other people's problems than asking for help with her own.

Over the last six months, the two of you have gone from taking in packages to coffee, borrowed tools, takeaway and the kind of casual visits neither of you ever officially called friendship.

Tonight, Sophie forgot her apartment key.

Her sister has the spare and should be here in about an hour.

With a storm moving in, Sophie knocks on your door and asks if she can wait inside.

It should be simple.

Except the storm keeps getting worse.

And the spare key isn't getting any closer.