There is a murderer loose in London who is killing off DA members. From Septremus to (Controller), everyone is under suspicion. When Tyler, Plusher and Scott are killed and when Chris lies in hospital, it is the team who must save each other

There is something bigger at stake. With the bounty hunter caught yet 4 agents dead the IDA wonder what light the missing Captain Thomas can throw on the subject. Who killed Al Bin Ay? Where is Captain Thomas? And why does the MOD seem reluctant to pass on any information?

Following from the shock ending of Part Two, The IDA are one of the organisations investigating the MOD's death. What is Thomas holding back? What is the big secret the MOD was hiding?