Issue Secret Six 1
Subtitle Six Degrees of Devastation, part one: Exposed
Date July 2006
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline Catman, Ragdoll, Scandal, and Knockout parachuted into a prison camp in North Korea. Deadshot got himself imprisoned in order to kill the warden for a client who's husband was killed there. They got their man and left the prisoners in control.
A few nights later, they were paid. Blake was told that the Society - and Dr. Psycho in particular - still had it out for them. They urged to bring in an unnamed new member, but Catman resisted.
Dr. Psycho could not convince the Society to go after the Six, but made a deal outside the ranks. While Catman visited their possible new member (Mad Hatter), the rest of the six (rather five) were all attacked: Ragdoll by Ibac in a restaurant, Deadshot by Lady Vic and Double-Dare while visiting his daughter, Scandal and Knockout by the Ravens on a balcony in Bangkok. Knockout was hit by a shot and something implanted in her. She pushed Scandal into the river below and exploded.

Issue Secret Six 2
Subtitle Six Degrees of Devastation, part two: The First Cut is the Deepest
Date August 2006
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline Lawton's ex-wife shot Lady Vic and she prepared for the killing blow, then tossed Floyd the gun. He let his attackers go due to his daughter being a witness to the situation. Ragdoll escaped his predator by using steak knives. Scandal found Knockout - still alive - under the wreckage. She felt the rage of her father for the first time.
Back at their hideout, Scandal began on Pistolera, the woman who'd attacked her and Knockout. After an hour of torture, Pistolera gave up the person who'd called the hits: Cheshire. Catman and Scandal discussed letting her go, but Deadshot killed her anyway.
The Six (minus Ragdoll, who was hospitalized with dozens of broken bones) journeyed to the Himalayas in search of Cheshire. The entered a monastery and went through several monks before finding their target. She gave up Dr. Psycho as the person who'd called the hit and introduced Blake to his child. He called his team off - he couldn't kill the mother of his son.
Dr. Psycho, posing as a circus freak, visited Ragdoll in the hospital.

Issue Secret Six 3
Subtitle Six Degrees of Devastation, part three: The Darkest House
Date September 2006
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline Scandal and Blake went in to break Ragdoll out of the hospital. Though some feds stood in their way, they were successful.
Knockout took off her bandages and took a shower. Vandal Savage came to his daughter in a dream. He demanded she produce him an heir.
The team went after Lady Vic, who's location was given up by the Double Dare girls. As they neared the destination, Ragdoll flipped out and began attacking them. They were able to toss him out of the helicopter after he cut his own hand off so that Knockout would fall. Mad Hatter suffered some sort of seizure. After finding her girlfriend OK on the ground, Scandal heard her father threaten Knockout's life again.
Ragdoll came to his senses, claiming Dr. Psycho had caused his episode. Catman looked up to see the Doom Patrol standing above them.

Issue Secret Six 4
Subtitle Six Degrees of Devastation, part four: Spiders on the Wind
Date October 2006
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline Dr. Psycho and Cheshire met with Vandal Savage. He was most displeased that they'd led the Six to the Doom Patrol - he wanted Blake alive (to sire his heir).
The Doom Patrol and the Six fought it out. Mad Hatter caused the DP to turn on themselves. He was stopped before he made Elastigirl eat Beast Boy. The DP told them to get lost and they wouldn't come looking.
Back at HQ, Lawton called his ex-wife to tell her she'd never see him again - he didn't want them to get hurt due to him.
Savage came to his daughter again in a dream - if she wouldn't have a child, he would kill the rest of her team. She woke up to find her girlfriend with Deadshot.

Issue Secret Six 5
Subtitle Six Degrees of Devastation, part five: Life as we Know It
Date December 2006
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline Scandal went nuts, but Knockout had no clue why - on Apokolips, it was tradition after battle. Catman stopped her from killing everyone as Mad Hatter looked on gleefully. Scandal left and told them she'd kill either them or herself should anyone follow.
Knockout believed Scandal's exit was preplanned, she needed the incident to be a believable catalyst. Hatter agreed, telling them she was now with her father. The group prepared to visit Vandal Savage to get their friend back.
Savage chose Dr. Psycho as the father since Scandal refused to have Blake's child. As her friends arrived and attacked, she stabbed her father in the throat with chopsticks.
Hatter was able to disrupt Dr. Psycho's mental suggestions; Cheshire stabbed him in the back.

Issue Secret Six 6
Subtitle Six Degrees of Devastation, part six: Cutting the Cord
Date January 2007
Writer(s) Gail Simone
Artist(s) Brad Walker, Jimmy Palmiotti
storyline As the battle raged on between the Six and Savage's goons, the man of the house appeared and challenged his daughter. Catman got the antidote for Tetch from Cheshire, but had to promise her safe passage in return.
Hatter defeated Psycho; Blake gave him his cure. Savage gave up in his battle with his daughter and fell down the mountainside. Ragdoll shoved Tetch over the same ledge and met up with the rest of the group, telling them Hatter had decided to stay.
Hatter vowed revenge.
Notes, references to time, and chronology:
Pistolera was killed by Deadshot after being tortured by Scandal Savage.

Issue 4 appears to take place before the Doom Patrol's appearance in Titans Around the World, as Dayton is wearing his Mento helmet here.