Private message to Mr Finch-Fletchley

I've had an opportunity arise for a bit of fieldwork tomorrow night. Would you be interested in joining me and Auror Crouch for the evening?

I do not expect it to be tremendously dangerous, but of course there is always risk involved in operating under field conditions, however confident one is in one's abilities. Still, I judge it to be well within your capabilities. (Including, if you take my meaning, your well-demonstrated capability for discretion.)