A dog runs in front of Naumburg vet Maja's car on the way to her practice. Maja is late for her appointment with Julia Kramer, whom the clinic group Sanaripets sends her as a future colleague. Maja's boss Reiner Rückert is going into well-deserved retirement and wants to sell his small practice to the group. Maja and Julia take a practical approach to getting to know each other, examining the injured dog together and developing a personal relationship. When they discover evidence that the dog is being deliberately made ill, their suspicions initially fall on the dog owners' son and a neighbour. In order to save the dog's life, the two vets have to solve the mystery of who is harming him. In a race against time, Maja and Julia grow into a strong team. Will Julia ultimately decide against Sanaripets and in favour of Maja's practice...?