"An utterly enchanting, immersive novel about an irrepressible young heroine who becomes an undercover agent during World War II-a sparkling debut, by turns heartwarming and heartbreaking. One blustery night in 1928, a whale washes up on the shores of the English Channel. By law, all whales belong to the King, but twelve-year-old Cristabel Seagrave has other plans. She and the rest of the household and their guests-her sister, Flossie (known affectionately...