Dalziel and Pascoe: Soft Touch

What is the connection between an unidentifiable corpse found drown in the canal with a two year old AK47 bullet lodged in his spine and the murder of a wealthy, successful businessman who has just returned from Russia with a new order and a new Russian bride-to-be? This is the mystery that Dalziel and Pascoe must solve if they are to discover the murderer before Dalziel is moved sideways into a desk job to make way for "new blood"