Police Sergeant Catherine Cawood is retiring in seven months, one week, three days. A new trailer for the third and final season of BAFTA-winning crime drama “Happy Valley” reunites us with Catherine (Sarah Lancashire) on the brink of a major life change. Rather than winding down, her job seems to amp up in the months leading up to her retirement. We see her covered in cuts, bruises, and blood — after admitting to getting into “several” fights — and being asked about a murder.

Things are even more complicated at home. Her late daughter’s rapist (James Norton) is getting released from prison, and Catherine’s grandson (Rhys Connah) wants a relationship with his biological dad. “He’s using you, and you’re letting him,” the teenager is warned.

Sally Wainwright created “Happy Valley.” Her other series include “Gentleman Jack,” “Scott & Bailey,” and “Last Tango in Halifax.” Lancashire also stars in the latter.

“Happy Valley” returns to the BBC January 1.