Portal of Dragons — Cynthia Breeding

...Dragons...Shifters...Slayers Three dragon-shifters who fought with the Pendragon and King Arthur have been given the honor and duty of protecting three powerful stones-a sapphire, emerald and ruby-which Merlin removed from the rim of the Holy Grail to keep its power from falling into the hands of the traitor, Mordred. Mordred's Slayers hunt the dragons and as the centuries pass, the dragons' strength lessen. Time is soon running out. Each must find his true mate to restore his own power and keep the stones safe. If they haven't found their true mate within the last fifteen hundred years, will they be able to find one now before time runs out and evil rules the world? A Dragon's Tale - While on vacation in Wales, Margot Guthrie, a New York City reporter, accepts an invitation to a 'haunted' castle Halloween party, only the host is never seen. Hearing strange sounds from a locked tower off-limits to guests, she is determined to find out what is up there. Only the Marquis of Tremayne has other ideas. The Dragon's Lair - Margot's assistant, Tania Bjornson, arrives in Scotland after she receives an urgent message from Margot to meet her there. But when she steps foot on a remote isle off Skye, the beauty of the island feels oddly in conflict with a strange sense of foreboding, heightened only when the MacDonald chieftain claims to know nothing of Margot Guthrie. Home Of The Dragon - Emily Bjornson, Tania's twin, flies to southern England after a strange message from her sister about chasing dragons and searching for the Holy Grail. As a medieval literature major, she secures a job in a Glastonbury bookstore and books a room at Pendragon Hotel, a place where a baron was murdered after imprisoning his mad wife in the attic. When Emily starts seeing specters of knights and dragons, she wonders if she is losing her mind as well.