Riddles in Time — Tom McCloud

When students enter an archeology competition at a museum, they have no idea what strange and wonderful things are about to happen! Following a trail of mysterious clues left by a professor who's gone missing, they discover an ancient secret more powerful than time itself.

But with each new clue, the ancient mystery deepens as someone or something threatens to ruin the contest. Why do dangerous and ghostly visitors suddenly appear…only to mysteriously vanish after causing havoc and mayhem? Who else, besides the missing professor, knows about the ancient secret? Where does the mysterious trail lead?

On this amazing journey through time and self-discovery, four new friends must believe in themselves, travel into the past to solve history's biggest riddles, and save the world as we know it!