Kildar is a military fiction thriller novel by the author John Ringo. It is a sequel to his earlier book Ghost - the first in the Paladin of Shadows series - about the adventures of former US Navy SEAL Mike Harmon (A.K.A. Mike Jenkins, Ghost, and 'Ass-Boy Two') as he engages in combat with various terrorist groups. Mike buys the local castle and, as such, becomes known by the ancient title of Kildar, lord of the local families. He purchases equipment to build up the local infrastructure and hires some of his allies from his military days as trainers.