After winning a major battle against alien invaders Alex and Sam let a mysterious book guide their steps as they fight to save humanity.

Casteel Da'Neer knows all too well that very few are as cunning or vicious as the Blood Queen...Nothing will stop Poppy from freeing her King and destroying everything the Blood Crown stands for...Together, Poppy and Casteel must embrace traditions old and new to safeguard those they hold dear...But war is only the beginning. Ancient primal powers have already stirred, revealing the horror of what began eons ago. To end what the Blood Queen has begun,...

Follows the arrival of highly advanced alien visitors to Earth who bring sophisticated technology while imparting warnings of an antagonistic race that has already established a base on Mars.

Struggling to complete his final month of high school only to glimpse a UFO that exactly resembles an enemy ship from his favorite video game, Zack questions his sanity before becoming one of millions of gamers tasked with protecting the Earth during an alien invasion.

"Lin Sukai has won her first victory as Emperor, but the future of the Phoenix Empire hangs in the balance--and Lin is dangerously short of allies. As her own governors plot treason, the Shardless Few renew hostilities. Worse still, Lin discovers her old nemesis Nisong has joined forces with the rogue Alanga, Ragan. Both seek her death. Yet hope lies in history. Legend tells of seven mythic swords, forged in centuries past. If Lin can find them before...

Aoelyn, Talmadge and their remaining allies become Loch Beag's only defenders from an invasion by the once-forgotten Xoconai empire, while Brother Thaddeus discovers an ancient tomb of mysterious power.

A search for two of his missing lieutenants sends Geary to the moon Europa, despite its ban on all humans, where he discovers a growing, mysterious threat to the Alliance.

Max and her Jupiter Station team must learn to work together when their routine mission to retrieve a missing ship turns dangerous.

Two races break a fragile peace and start an all-out war, in which northerner Roper, thrust into an ill-prepared leadership position, and southerner Bellamer, a brash but capable general, are caught in the middle.