Thirteen-year-old Q and fifteen-year-old Angela expect their lives to become complicated when his mother and her father, wildly popular musicians, marry, but not that they will face spies and terrorists in Philadelphia, Pennsylvania.

"The president's daughter has been kidnapped by the elusive and lethal Ghost Cell. Quest (Q) and Angela are in hot pursuit with vicious winds and blinding rain thwarting them at every turn. It's a desperate high stakes chase"--

"After thwarting the ghost cell's chemical attack in Chicago, Q and his stepsister Angela arrive in San Francisco to continue their parents' concert tour. They find themselves helping Boone and the S.O.S. team in the final showdown with the ghost cell and its leader, Number One"--

"Torn from their lives as regular Librarian's kids, Max, Ingrid, and Luke must survive in a hidden Librarian outpost--underwater! While their parents scramble to safeguard the books of the Overworld, the trio sneak out of their warren of underwater caves to investigate the deep waters of the oceans. When they hear about the Legend of the Coral Caves, a trove of golden coral beyond imagining, Max, Luke, and Ingrid realize that this wealth could help...