Sword Art Online, light novel Vol. 20: Moon Cradle

It's back to the drawing board as the kidnapper just barely slips from Kirito's grasp. The new plan calls for a visit to the scene of the crime so that Asuna can use her scrying art to peek into the past, though what she learns is troubling to say the least...But before they can act on the new information, the villain strikes again! This time, Ronie and Tiese have been captured, and their fates rest in the claws of a young yellow dragon...!