The 4th Man (eSHORT)

FBI Profiler Pierce Quincy, Officer Rainie Conner and Boston Detective D.D. Warren come together on a baffling cold case:  A young woman is found strangled in the stairwell of a college library, with only her shoes missing. All the police have to go on are the three men who were in the library with her at the time, but none of them can be proven guilty.  Five years later, will Quincy and Rainie be able to help D.D. build a case against one of the three suspects, or is there a fourth man out there? And if the killer has eluded the police this long, how far will he go to ensure justice is never served?