Once a luxurious southern getaway on a rustic lake, then reduced to a dilapidated crash pad, the Summer House is now the grisly scene of a nighttime mass murder. Eyewitnesses point to four Army Rangers — known as the Night Ninjas — recently returned from Afghanistan. To ensure that justice is done, the Army sends Major Jeremiah Cook, a veteran and former NYPD cop, to investigate. But the ma...