Mike's past comes back to haunt him when his old flame Penny arrives claiming he is the father of her baby. To make matters a lot worse, DI Shiner warns Nick that two gangsters who Mike nailed in London have been released from prison with vengeance on their mind. Meanwhile, Greengrass falls in love with a poacher called Tessa Blundell, while Nick and Jo make big plans for the future, which could mean big changes at Ashfordly station.