While on a dig in a Romanian forest, a group of scientists make a startling find. Dating back to the 13th century, they find a huge abbey, which was built over the entrance to a massive network of subterranean caves. Eager to learn what lies within the caves, the scientists discover to their peril that a large part of the cave system is under water. The scientists hire a team of American spelunkers who are trained in exploring underwater caves. The...

An important discovery puts Roger the Chapman's life in danger . . . - In the autumn of 1483, Roger goes on an errand of mercy to Hereford, where he is caught up in the Duke of Buckingham's rebellion against the new king, Richard III. Roger takes refuge in Tintern Abbey, but on his return to Bristol, a murder and a series of house robberies lead him to the eventual discovery of the treasure stolen from the abbey on the night he was there. It also...