Midnight treasure hunts, fancy-dress parties, and a blue-blooded murder . . . November, 1923. Olive's school chum, Gigi, invites Olive to London because Gigi's dotty grandmother fears for her life--or so she's said to Gigi. However Olive is surprised to find that the dowager is far from muddled. The sharp and imperious matriarch refuses to admit to her worries and sends Olive on her way. Without a client or case, Olive...