Star Trek: Malefictorum (Star Trek: Starfleet Corps of Engineers Book 50)

Without warning, a member of the da Vinci crew is found dead in his quarters. Lt. Commander Corsi's investigation is thorough and complete -- and turns up nothing. With all the technology at Starfleet's disposal, with all the technical expertise of the ship's crack team of S.C.E. engineers, no forensic evidence can be found to explain the fatality. With the possibility of an unknown murderer on board, Corsi must use all her training to solve the mystery -- before another body falls...