Becky is the math whiz, but Sam is pretty sure he can count to four--or can he?

Sam and Becky have visited a lot of lighthouses during their summer vacations (helping Mom and Dad write their book about lighthouses), so Sam knows how to count lighthouse flashes. Why is this one so different?

For two whole weeks, Sam, Becky, Mom and Dad are staying on North Carolina's amazing Oak Island and sharing a house-- right on the beach--with Dad's best friend and his family. What starts out as a typical vacation quickly becomes a series of puzzling events when Sam and Becky and their new friends realize that they all share the same secret about the Oak Island Lighthouse.

Join the kids as they solve puzzles and try to figure out where the clues are leading, but beware! For pirates have roamed the treach-erous waters around Cape Fear--and some say they still do. It's all part of the mystery of Oak Island and the magic of summer in North Carolina.