En un presunto ataque terrorista en un hotel de Londres, un ministro del gobierno es asesinado. Mientras Sam y el equipo investigan el caso, antiguos amigos y funcionarios del gobierno pronto complican las cosas.

Harry Cunningham investigates the death of a young Orthodox Jew. He accedes to the family's request that he not use invasive procedures in his examination and finds that the young man was savagely kicked and beaten to death. DI McKenzie has a suspect in custody but from what medical and forensic evidence Harry is able to find, with Nikki Alexander's assistance, it's obvious that the family is lying about the young man's whereabouts the night he was killed. Leo Dalton meanwhile investigates the death of a young student who died from a drug overdose. Leo is uncomfortable with what he finds, particularly that she had sex with one of the men at a party when her boyfriend was in the next room. He thinks she may have been given GHB.

With a second member of the Orthodox Jewish community dead, Harry performs a complete examination. This time, Harry does not hesitate to use all examination methods at his disposal and finds forensic evidence that clearly links a third member of the Hassidic community to both deaths. After DI MacKenzie makes the arrest however, Harry realizes he may have inadvertently contaminated the DNA evidence leading to a false result. Nikki retests all of the evidence and together they figure just who the attacker was. Leo Dalton meanwhile tries to prove that the dead student had been given GHB. He concludes that someone also tried to administer CPR.