The Weekend team is taking a break. So for the next two weeks, we’re looking back at some of our favourite pieces of the year. This week, historian Lucy Worsley unravels the mystery disappearance of Agatha Christie (1m37s), fashion editor Jess Cartner-Morley talks to singer and actress Willow Smith about her complicated relationship with the limelight (18m45s), and Bronwyn Adcock gains a little insight from a radical Buddhist nun on the secret to happiness (38m31s)