THE CONSTANT GARDENER A Novel by JOHN LE CARRE Frightening, heartbreaking, and exquisitely calibrated, John le Carre's new novel opens with the gruesome murder of the young and beautiful Tessa Quayle near northern Kenya's Lake Turkana, the birthplace of mankind. Her putative African lover and raveling companion, a doctor with one of the aid agencies, has vanished from the scene of the crime. Te...