Abby Schoenberg isn't looking forward to the summer before her senior year. She's just broken up with her first boyfriend and her friends are all off in different, exciting directions for the next three months. When she finds love letters among her recently deceased grandmother's possessions-- letters from a mystery man named Edward-- Abby heads to Nantucket for the summer to learn more about her grandmother and the secrets she kept. Edward's grandson...

When a two-hundred-pound sea turtle goes missing from the Bayport Aquarium, Frank and Joe Hardy investigate, discovering a network of underground tunnels hidden beneath Bayport that is aiding a sinister smuggling ring.

"Strange flash floods are making waves (and headlines) all over the Big Forest! Someone is pulling off particularly confounding capers and, between the flooding and the heists, Big Forest is in big trouble. When Madame HQ is nabbed right out of a very wet Woodland HQ, Agent Moose and Owlfred must wade through clues to get her back and stop the mystery criminal making a big splash in Big Forest! Can they find this fiendish villain before Big Forest...