When the team attend a Dark Morris Dancing event, the ‘Legend of the Knuckerhole Dragon', Margo finds herself at the centre of a crime when a member of her team collapses during their performance. With a severe allergic reaction to blame, and the victim's epi-pen case empty, Humphrey is stumped as to how the attack was triggered unseen whilst all eyes were on the stage.
As jealousy and secrets come to light, the targeting of the victim's allergic reaction begins to paint a sinister picture. And with a connection to the crime, Margo is put to the test as she goes undercover to see what clues a familiar face might hold.
Meanwhile, Humphrey and Martha take a big step on their homeowning journey, but Humphrey's mind is preoccupied when a powerful figure from the Hub arrives at the station looking for answers. Elsewhere, Esther is floored when Zoe suddenly reveals her decision to travel the world.
