[Digory]

Our exterminator told us they're terribly common and difficult to 'solve,' especially in a house with a wood shake roof.

He suggests ignoring them, unless you find they've wiped out all the other spiders in your house. The brown recluse is, apparently, the apex spider in mid-Missouri.

Even then, sticky traps are the best recourse; because they're reclusive loners, they don't spread poison to others.