Christina F. York & J. Steven York 
Enigma Ship [EPUB ebook] 

Sent to investigate the mysterious disappearances of several Federation starships, the U.S.S. da Vinci discovers a true technological marvel: a holographic vessel. Commander Sonya Gomez and her S.C.E. team try to navigate the different holographic scenarios playing inside the "holoship, " and are surprised to find the crews of the missing ships — who think they’ve been rescued! Gomez and her team must convince the crews that they are trapped in an endless holographic program, or risk losing them forever!