There's something going bump on the Metropolitan line and Sergeant Jaget Kumar knows exactly to call.It's PC Peter Grant's špeciality . . .Only it's more than going 'bump'. Traumatizovaní travellers majú been reporting strange encounters on ich ráno commute, s strangely dressed people trying to deliver an urgent message. Stranger still, despite volaním policajných komôr, s niekoľkými minútami komunikátorov majú already forgotten the encounter - making the follow up rozhovory rather difficult. So s malým pomocníkom z Abigail a Toby duchom loviť pes, Peter a Jaget sú hlavou mimo duchu lovingu expedice .