Another outing for the Marlin and its Chief Officer Webb Carrick of Fishery Protection when two nature conservationists, branding some seals on a remote island, disappear. There's the Hellspot there--a freak hole which leads to some Devil's Triangle speculation, but Carrick more practically relates the missing men to I.R.A. gun-running. Knox is always on solid water and this is quite good in the ongoing series--sure to hold your attention from 2000 to 2200.