***** S11E01 Another Life
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Seven months after his suspension, Frost is reinstated to Denton CID, and Caldwell has been murdered in prison. Teamed up with DS Maureen Lawson, Frost is thrust into two different murder investigations, while contending with toothache after enjoying a defective lollipop. A dismembered body is found in a fridge, which when pieced together is revealed to have a second left foot traced to a different person. It transpires that the victim is linked to the highly-competitive local ballroom scene. Victory-obsessed dancer Delores Delmonte (Amanda Root) is identified as the culprit, having killed the victim because he abandoned her for a different partner, and she is caught preparing to kill her new partner after losing the latest competition. Following her arrest, the remorseless Delmonte states she was putting the men out of their misery as they were not skilled enough to compete at her level.

A separate murder case focuses on Eddie Burrows, a man stabbed to death and dumped in a canal while holding œ6000 in cash. Discovered to be leading separate lives with wives and children, Frost questions whether one of the wives learned of this and took revenge. However, Frost soon uncovers that Burrows was blackmailing a local doctor, Patrick Knight, and a pharmacist for large sums of money after learning of their fraudulent medicine scheme. At risk of losing her affluent lifestyle due to Burrows' costly demands, Knight's wife, Antonia (Lucy Robinson), confronted Burrows to convince him to stop, but when he mocked her, she lost her temper and stabbed him.

***** S11E02 Dancing in the Dark
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A man's body is found on a waste tip, stripped of everything but his clothes and an empty wallet. After his wife, Diane Hawkins, reports the man, Joe, missing, Frost learns that Joe was an absent, abusive, and alcoholic husband, and the meek Diane had fallen in love with the equally meek sleep therapist Colin Bayliss. Diane attempts to take money from the sleeping Joe before running away with Colin, but Joe awoke and began choking on his own vomit. In a panic, Diane and Colin smothered him and dumped his body trying to make it look like a mugging. As it is unclear if Colin died from the choking or smothering, Frost is unsure if either will be prosecuted.

Alongside cocky young undergraduate DC Jasper Tranter (Nicholas Burns), Frost investigates the murder of a young escort, Heather Wills (Amber Sainsbury), who is found dead in a hotel room. The hotel room was registered to wealthy businessman Stephen Richford, a close family friend of Heather. He had booked an escort, which turned out to be Heather, and she set about seducing him for money. Guilt-ridden for sleeping with his daughter's best friend, Stephen is later found dead in an apparent suicide. Heather's apartment is ransacked for something, which Frost later discovers concealed in Heather's purse-forged passports used to smuggle women into the UK, which Heather was withholding from her boss until she was paid more money. Though Heather's boss is involved in the smuggling, Frost realises that it is his business partner, the ruthless Terry Hirst, that killed Heather and staged Stephen's suicide to frame him for her murder. Frost prepares a sting operation at a greyhound race track to draw Hirst out and arrest him.