Another classic mystery from the 'Master of the Clever Twist'. One summer's day in 1981 a two-year-old girl, Tamsin Hall, was abducted during a picnic at the famous prehistoric site of Avebury in Wiltshire. Her seven-year-old sister Miranda was knocked down and killed by the abductor's van. The girls were in the care of their nanny, Sally Wilkinson. One of the witnesses to this tragic event was...