We pick up from where we left off in Season 6 with Horatio being shot as the team comes to grips with his death. Juan Ortega, a known munitions dealer selling rare fused alloy bullets, had recently put a hit on Horatio. Ortega makes his way to Ron Saris' house and beats him. An Emitter used to manipulate the traffic light signal that set up armored robbery is mysteriously linked to ATF agent Jake Berkeley.
Jake has been working undercover detail with the Crypts Kings and provides Calleigh with some useful intelligence at the expense blowing his cover. Ortega and Saris were in business together but once Ortega was put in jail Saris maneuvered to take over the business which didn't sit well with Ortega. Ortega is eventually tracked down loading money onto a helicopter but the fused alloy bullets are no where to be found.
In the end, we discover that Ron Saris orchestrated the armored car robbery and killed the driver. Horatio uses Julia to set Ron up and we end with a standoff on a yacht that happens to be loaded with all the fused alloy bullets. The yacht blows up when Horatio shoots and misses Saris, hitting a propane tank. However, when combing the wreckage, they find no trace of Saris' remains.