Kai Norden finds his mother Martha increasingly distracted, diagnosed in ER after a fall with dementia. Doc Jasmin has her doubts about he new colleague, but her chief isn't amused when she accuses him off hiding a near-fatal medication error and drinking, assuming she's lying to avoid sanctions for the kalium, so she gets suspended. However he's stopped for reckless driving and refuses an alcohol test, then is mysteriously cleared in lab, but the cops find out how.

Young high school teacher Anna Mahler is hospitalized, after drinking floral atropine-poisoned wine. Although happily married, she was suspiciously close with several students, notably from the school play. Suspects thus include Andreas, Thomas and jealous girl friend Louisa. Henning Storm is in no mood to take serious his ex's latest pointless call for 'police' help, Kai arranges a home for his dementing mother.

Retired cripple 'colonel' Chris Stein runs a box gym. When he's brought to ER, fallen badly from the ring stage in his wheelchair, cop friend Henning Storm refuses to believe that an accident, steps in as interim manager and has the whole team look for suspects and motives. They include a fighter dismisses for drug dealings and a dodgy rival who lost a lot plotting fights and transfers. Even Chris's protege Mike hides malversation.