The Clue at Fort Point

When Becky and Sam welcome their cousins to the San Francisco Bay Area, they expect it to be fun. What they didn't expect was to find themselves right smack dab in the middle of another lighthouse mystery adventure-this one in their own backyard!
Strange things start happening soon after they meet Jeremy and Mikey at the San Francisco International Airport and learn about Uncle Al's "Mystery Word Contest."
Winning the contest becomes their top priority, but what's up with that creepy car following Dad?
With the famous Golden Gate Bridge towering above, they make their way to the very edge of the continent where they find shipwrecks, lighthouses, and a clue at Fort Point.