Gwyneth and Gerward Mason become eyewitnesses to a miraculous discovery: the abbey monks accidentally find an oak coffin in the ground, in which two skeletons and a mysterious cross are found. Has the unprecedented happened, and the remains belong to the legendary King Arthur and his wife Guinevere? After all, the cross testifies to this!.. But a misfortune occurs - the monk guarding the find is killed, and the priceless relics have disappeared! Gwyneth and Gerward have to take on enormous responsibility and find sacred relics that will bring happiness and prosperity to their native abbey! But on their way they face mortal dangers, insidious traps and insidious enemies. Will the brother and sister have enough courage and determination to go to the end?.. Incredibly exciting, incredibly mysterious, scary to the point of goosebumps, but very, very, very interesting!!!