I really, REALLY thought Harry was the extra person/escaped inmate.

"Harry's my husband, so it couldn't be him" not "MY husband, Harry, had been with me since the beginning."

And if the "driver" and Harry are BOTH now missing, it kind of confirms that either: 1) the driver escaped and Harry & OP are helping him, 2) HARRY escaped, the "driver" is a friend of Harry's/Harry's and OP's, or 3) TWO+ inmates escaped, but it hasn't yet been noticed/reported that there were more than one and Harry AND the "driver" escaped.