re: A mouse or two...is there more

You must set a dozen Victor snap traps. Use the older Victor brand traps and bait them with peanut butter. Also use the 1 bite poison, in bait stations so pets don't encounter it. Place it underneath home if home is elevated, place near where rats and mice are entering the home. Rats in the attic must leave and return in search for food. The one bite poison should kill them before they can return back to the attic. I do my own pest control using the products below. They work.

Here's a pet/child pet resistant station with bait.
LINK

Here's the refill bait. Has Bromethalin. Fast Kill to mice and rats.
LINK