Ashes to Ashes (2008)

S03E04 Episode 4

Gene finds out that an undercover sting aimed at capturing multiple drug dealers is happening in his territory without his awareness. Eager to assert his authority, he exposes an undercover agent who arrives at CID and ultimately puts the operative under his guard. However, it appears that there’s a mole within the department who is sabotaging efforts to keep the dealers off the streets. At the same time, Alex is still tormented by the spirit of a fallen officer. Could this ghost actually be the solution to her return home?