Klingon ships have attacked repeaters in the Federation’s subspace communications network, and Starfleet Command believes that it may be a prelude to invasion. Join a Federation task force in confronting the Klingons at the border in a show of force to push them back – by diplomacy if possible and combat if necessary. But the Klingons have a plan of their own… ”The Battle of Caleb IV” is the next mission for the 23rd century story, and will draw the captain into events discussed in the Deep Spa…