As the search continues for missing mother-of-two Nicola Bulley, a lot of questions have been raised about her mysterious disappearance. In this live programme, Dan Walker explores the circumstances of her vanishing. He will speak to experts, those who know Nicola, and the police. The show will raise important questions, including what Nicola's fitness tracker could potentially reveal? Why did she leave her phone on the bench? And how can a woman simply disappear leaving no trace?