A massive rip in the fabric of space and time leaves Space command's deep space fleet stuck on the other side of the rift. Meanwhile alien ships from another dimension arrive on Earth en masse on the other side of the divide. Captain Maguire, a decorated graduate of the Space command academy, whose unorthodox approach to duty is also his strength in a desperate bid to defend commands his starship the Sandawana into the rift in a desperate bid to defend Earth. 
Arriving on Earth he initiates the counter attack to repel the alien ships from Earth.  Other starships of  Space command's deep space fleet arrive on Earth to support the Sandawana's fight against the alien ships. Under the vicious barrage of lasers and missiles from Space command's deep space fleet, the alien ships begin to withdraw to their own dimension. But as they retreat the aliens launch a ground operation and take a senior Space fleet officer captive. 
Captain Maguire is forced to pursue the aliens taking the fight to their home world.

Interdimensional, a starship trilogy

A convoy of starships from the Deep space fleet entered neutral space in formation in response to the presence of a large fleet of alien vessels. An alien fleet of what could only be described as an armada of vast proportions was fast approaching. According to information from the Earth 's observation posts in deep space the trajectory and size of the alien fleet could only suggest only thing, a massive surprise attack. Space command was not taking chances with a such a large number of vessels of unknown origin and was leaving nothing to chance. 


Why would anyone be coming with a large fleet of they were friendly and only wanted to say, "hi". If the admiralty at space command had read the situation wrong, it was still better to err on the side of caution than to allow a massive incursion into Earth's space by unknown beings. 


Opening moves