Cal gets a Calling that takes him to Eureka as he's convinced he needs to stop testing on the tail fin.

In order to stop the experiments at Eureka, Ben, Cal, and Mick have all gotten concerning Callings.

With Cal's life hanging in the balance, Saanvi and Ben go to great lengths to save him. Will they find a way?

Ben and Saanvi undertake a treacherous mission to save someone they love, which includes her partner from Eureka.