It's hard to guess without a sense of scale (size) and from the shed skin itself. Its behavior suggests a Ratsnake, and they can be lighter in color while juveniles. Kingsnakes often eat other snakes, so we doubt one is exploring indoors, though to be fair, they can also prey on mice and a few other small animals. Since this is outside of the realm of our expertise, someone can inquire with wildlife biologists at the MD Department of Natural Resources. An email can be sent to <personal data hidden> (especially if you want to share photos) or, if you would like to speak to someone, they have a Wildlife and Heritage Service phone number at<personal data hidden>. The phone line is staffed during regular business hours, 8:00 am to 4:30 pm, except state holidays and weekends.

If useful, for anyone who sees the actual snake, the following ID guides might be useful:

• Common Snakes of Maryland Photo Guide -- MD DNR
• Maryland Snakes -- MD DNR
• Snakes of Virginia -- Virginia Herpetological Society (most, though not all, of the species in VA can be found in MD, and this resource goes into more detail than the other two)

Miri