Old bones

When a young couple discover human remains buried in the garden of their new house, Detective Inspector Bill Slider is called upon to investigate. It appears that they have found the final resting place of fourteen-year-old Amanda Knight, who disappeared from that same garden two decades before. With a murder twenty years in the past, this is the coldest of cold cases. Most of the suspects and principal players are now dead, and all the passion is long spent ... or is it?