Kate Humble and Ben Fogle present a special edition from Longleat safari park. It's every safari park's worst nightmare: a dangerous animal on the loose. Emergency measures at Longleat are tested to their limit. There's a murder mystery to solve on Meerkat Mountain - who is the culprit? On the rest of the estate, it is all hands on deck as lambing season gets under way. Kate looks at the butterflies to be found at Longleat.