A green ghost oozes through the walls of a crumbling old mansion, leading The Three Investigators to an open coffin and a grinning skeleton wearing a string of priceless Chinese Ghost Pearls. When the ghost disappears--along with the pearls--the sleuths are off on their strangest case ever!
Maud, an aging grandmother, is slowly losing her memory—and her grip on everyday life. Yet she refuses to forget her best friend Elizabeth, whom she is convinced is missing and in terrible danger. This singular obsession forms a cornerstone of Maud's rapidly dissolving present. But the clues she discovers seem only to lead her deeper into her past, to another unsolved disappearance: her sister, Sukey, who vanished shortly after World War II.
George Dundas has been disowned by his wealthy uncle for refusing to work hard. As he contemplates his fate, socialite Mary Montresor passes by in her car. She takes him off to the country and proposes marriage. They stop to investigate a pretty country house, and a maid opens the door to them. Mary picks a name at random and asks if the house belongs to Mrs. Pardonstenger. Amazingly, the maid leads them inside, where they encounter a very dangerous situation .
As the cops close in, every couple in town is soon wondering how well they know the one that they love. With his twin sister, Margo, at his side, Nick stands by his innocence. Trouble is, if Nick didn't do it, where is that beautiful wife? And what was in that silvery gift box hidden in the back of her bedroom closet?
With the situation in Rome deteriorating, Vespasian flees the city to take up his position as tribune in an unfashionable legion on the Balkan frontier. But even here there is no escaping the politics of Rome. Unblooded and inexperienced, he must lead his men in savage battle with hostile mountain tribes—dangerous enough without renegade Praetorians and Imperial agents trying to kill him too. Somehow, he must survive long enough to uncover the identity of the traitors behind the growing…
It is Tib the black cat who leads Mary to the strange flower in the woods. When she discovers a little broomstick shortly afterwards, she is astonished to feel it jump in to action. Before she can gather her wits, it is whisking her over the treetops, above the clouds, and in to the grounds of Endor College, where: 'All Examinations Coached for by A Competent Staff of Fully-Qualified Witches.'
On holiday in Cornwall, the three Drew children discover an ancient map in the attic of the house that they are staying in. They know immediately that it is special. It is even more than that -- the key to finding a grail, a source of power to fight the forces of evil known as the Dark. And in searching for it themselves, the Drews put their very lives in peril.