剧情介绍
Acaveinofalocalcanaltunnelunderrestorationrevealstheskeletonsofeightindividuals.Whilemostoftheskeletonsarefromacaveinwhenthecanalwasunderconstructioninthe19thcentury,oneisobviouslyofamorerecentvintage.DentalrecordsidentifyhimasEricEdwardswhowasreportedmissingin1965.Supt.Barnabydelvesintothehistoryofthecanaltosee...