Phantom sun

Phantom Sun: When an unidentified drone crashes in Antarctica, and the research station nearby stops communicating, Ryan Cross and the Shadow Squadron are sent to investigate--but their job is complicated by a Russian special forces team, and an officer of Phantom Cell who is more interested in the device than the safety of the American scientists. White needle: Ryan Cross and the Shadow Squadron have been assigned to recover a chemical weapon that has been stolen by an extremist wing of the Syrian rebels before it can be launched against an unknown target.