Finished, they would part and continue to pursue whatever mysterious errand they had been on.

Adrian had risen early and gone off on some mysterious errand.

Instead of passing by on some mysterious errand, however, the man called out as they neared.

It hadn't seemed likely, with everyone called off on some mysterious errand.

Jones has had enough and leaves on a mysterious errand.

That it was bound on a mysterious errand instead seemed interesting.

Was it the same thing that had caused Richard Brown to leave on his mysterious errand?

Sunspark had disðappeared on some mysterious errand of its own.

"Off on some mysterious errand of her own," Lily said.

I was out late at night on a mysterious but innocent errand.