Pair of Identical Murders

On the way home from the store, Mick comes across a murder scene which he reports to the police. When the police investigate, they find the scene as he described it, but with a different victim. So Mick is now the suspect! This puts Mick into the position of having to investigate the crime himself - along with his gorgeous wife, Carol.There are four primary suspects, all of whose names start with the letter 'D.' Two of them usually lie - but not always, and the other two usually tell the truth - but not always. Mick uses a type of logic known as 'Boolean logic' (which is used in computers) to solve the case. The case gets interesting when Mick and Carol find that the killers are two powerful people. Untenable? Yes - but Mick makes a brilliant move with the artifacts of the crime, and frames them in a way that's indisputable.