Lost City Explorers #4

"Hel Coates, her brother and our teenage urban explorers have journeyed through underground New York City and discovered the site where Hel's father disappeared, but in order to find answers and unlock the doorway to the mythical Lost City of Atlantis, they must first deal with the deadly supernatural guardian. Explore science fiction and archaeology in this new adventure series by Zack Kaplan (Eclipse, Port of Earth) and Alvaro Sarraseca (Magnus, Turok) that HAD to be told at AfterShock."