Twelve-year-old February Callendar and her older brother Friday are home from their Yorkshire boarding school for the summer. For fun, Friday has been doggedly digging a tunnel through the family's backyard. When their father, a war correspondent, leaves to cover an international crisis, February and Friday escape their holiday tutor and become involved in a magnificent intrigue involving, among other things, a suspicious plane crash, a mysterious mineral, a comic strip that may contain secret messages, and of course, the most important ingredient--Friday's tunnel, which brings everything to a wildly funny conclusion right in their own back yard.
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