When a fire on a houseboat leads to the discovery of the charred body of Leslie Whittaker, Banks and Annie believe they have uncovered a case of art fraud when a briefcase, containing a forgery of a famous Turner painting and £25,000 in cash, is found in the hull of the boat. At the scene, Banks trawls through the wreckage of the boat, and is informed that an unoccupied second boat, belonging to British Waterways, was moored alongside Whittaker’s boat at the time of the fire, and that it subsequently sank when the fire spread onto it. The investigation soon leads to Jake McMahon, a local artist known to have connections with Whittaker. When Banks visits his house, he is confronted by a gun-wielding McMahon, who appears to believe that Banks is a man named Morrison. Banks manages to prove him otherwise, but he denies any involvement in art forgery. The post mortem on Whittaker discovers that he had been drugged prior to the time of the fire, meaning that he had no chance of escape once the fire had started. Annie enlists the help of art expert Mark Keane, in an attempt to discover if Whittaker could have gotten away with passing the Turner off as a real painting. However, things get steamy between the pair, and they subsequently sleep together. Meanwhile, Banks receives a shock when a second body is found - that of local student Christina Aspen.