Invisible Grave

Sergeant Daniel Brett starts his first day with Chesterford CID fired up with ambition to get a permanent position. Brett is concerned that the case he has been assigned to is impossible to solve even though a strong suspect has been identified. More worrying still to the young Sergeant is the strange behaviour of his superior, DI Lock, who displays a mixture of logical brilliance and unorthodox eccentricity.
Brett and Lock interview the suspect, James Richardson, a businessman suspected of killing for financial gain. Richardson is quick to point out that without the body of the missing man there is no proof he is even dead. Richardson gloats over the absence of evidence and Lock warns him that one day he may meet his intellectual superior and face his downfall as a result. Brett is impressed by Lock's sharp mind and his determination to solve the case as their investigation progresses.
When the truth begins to surface about the disappearance the danger which overtook the missing man overshadows Lock and Brett realises he may have under estimated just how far the DI will go to crack the case and catch a killer.