As DCs Jo Masters, Terry Perkins and Zain Nadir give station tours, Kent spots them and tells them to stay where they are.
As DCI Jack Meadows prepares to open the 50th anniversary proceedings, he sends PC Dan Casper to find Superintendent Prosser.
As he enters CID, he is taken hostage by Clarke along with the rest of the group, however in the confusion Prosser grabs a radio and alerts CAD to the situation.
Clarke fires a shot at Prosser and misses, but the gunshot is heard by the partygoers and glass from a CID window almost hits PC Roger Valentine out front.
DCI Meadows takes DSs Phil Hunter and Samantha Nixon to the reception, and Sergeant Dale Smith goes to the door to be briefed.
Terry makes Dan comfortable and begins his own negotiation, and manages to find a mic and earpiece when Clarke throws all the phones out the window.
Thinking they are out of the way, Clarke begins to escape CID holding Terry hostage as Phil and Zain try to free Ashley from the boot of the car.
The crash team revived him, and back at Sun Hill DS Samantha Nixon found out that the shooting victim's clothes were US-made, and after contacting Interpol and the FBI, discovered the fingerprint on file was registered to the real Gabriel Kent.
Attending a call about burning clothes being thrown from a block of flats, Gabriel noticed an arrest team down below and dragged June up to the roof as a hostage.
PC Sheelagh Murphy, engaged to Gabriel at the time of his death, left Sun Hill after his inquest to join the Child Protection Team, having initially planned a resignation in the wake of his suicide.