Season 4

Prime Suspect (1991), Season 4 is the British crime drama you can watch online on iFILM — three feature-length films from 1995 with Helen Mirren back as Jane Tennison. The rank keeps rising. So does what it costs her.

Newly promoted, Tennison returns to Southampton Row and takes on the murder of a young child, a case where a single misstep cuts deep. Then comes a death in a comfortable commuter suburb, dressed up to read as suicide and tangled with people who have plenty to hide. The last story turns inward: a run of killings circles back to an old adversary named Marlow, and the fallout reaches past the job into everything she has left outside it.

Each entry runs as its own self-contained film rather than a slice of one arc, so Season 4 plays like three tight detective stories in a row. Mirren works Tennison harder here, and lets the wear show — less victory, more bill coming due. Stream Prime Suspect Season 4 online on iFILM.