It's the spring of 1987 and Syd Siegfried has discovered a mysterious atlas left behind by a dying priest—but what starts as an exciting trek through Philadelphia suddenly becomes a perilous adventure when the ancient relic sends him on a journey into the wildest unknown.

With the help of his plucky daughter Abby and an eccentric group of misfits, Syd will need to follow the clues and solve the atlas for a treasure that holds one their hometown of Philadelphia's most kept secrets – but nothing can prepare them for what comes next when they uncover a shocking secret...

If you're a fan of adult mystery sprinkled with a bit of humor and 80's nostalgia, then this will have you on the edge of your seat guessing what's next as our heroes unravel the truth behind Philadelphia's greatest secret.