THE BOOK OF LIES By Mary Horlock Harper Perennial, 357 pp., paperback, $14.99 In Mary Horlock’s surefooted, smart debut novel, questions of right and wrong, blame and forgiveness play out in twinned storylines set on the tiny Channel Island of Guernsey. Occupied by the Germans from 1940 to 1945, Guernsey is “only vaguely part of the United Kingdom,’’ according to ...