Monty Don explores the difficulties in keeping secrets and the effects of secrecy on rare orchids and rhinos. For the lady's slipper orchid in England, reduced to a single plant, secrecy was considered the only solution for many years, but when collectors discovered its site, conservation strategy changed. Rhinos, like other creatures with a price on their heads are very vulnerable and even in the 21st century; secrecy still plays a part in their conservation.