David Drake 
Lt. Leary, Commanding [EPUB ebook] 

The RCN series (also known as the Lt. Leary series) is a sequence of stand-alone science fiction novels revolving around Daniel Leary, an officer in the Republic of Cinnabar Navy (RCN). In this book, the second in the series, Lt. Daniel Leary commands the Princess Cecile; Signals Officer Adele Mundy has the spy apparatus and skill to crack any database. All they lack are enemies, and fate is about to supply those in abundance!