This chapter is really just to summarise the beginning events without just repeating the show, just to refresh anyone's memory.
Clarke lifted her head from her drawings at the sound of the door to her cell being opened. Armed guards entered and attempted to subdue her. She escaped, bolting from the room and was met by the sight of the rest of the 100 'juvenile delinquents' being led from the cells as well. Before panic could overwhelm her she heard her mother's voice calling her name. Abby Griffin explained that the 100 were being sent to the ground in a last ditch effort to save the lives of the people remaining on the dying Ark. Not that they knew it was dying, the council realised that Clarke knew of her father's discovery and threw her in solitary to prevent her from following in her father's footsteps and risk causing an Ark-wide panic.
After the drop ship landed successfully Clarke knew she had to focus her attention on getting the supplies from Mount Weather, just like her mother told her. She also worked on avoiding Wells and trying not to get herself killed. It turned out the last one was harder than she thought. Bellamy refused to help Clarke get everyone across to Mount Weather so she went with Finn, a boy who was arrested for wasting three months of oxygen on an unauthorised space walk, Jasper and Monty, who were arrested for taking herbs from agro station for…less than medical purposes, and Octavia, Bellamy's sister. But they had to return empty handed when Octavia was attacked by a mutated creature living in the water.
All the while, Bellamy Blake, the man she met in another life, back on the Ark, before her time in solitary, spent his time riling up the members of the 100 with his cries of 'whatever the hell we want.' With the help of his merry band of idiots, who followed his orders like puppets, he wielded control of the chaos.
'Whatever the hell we want' apparently included whichever girls Bellamy wanted to take back to his tent night after night.
Clarke refused to bow to him, she refused to be intimidated by the 'Rebel King'. Using their strange history to her advantage, she took him to save Jasper when he was captured by the Grounders on another trip to find resources. Clarke knew he had a gun from the Ark, and she had seen what was out there now.
What she didn't expect was for him to save her life.
They located the injured Jasper, strung up in a tree as bait but in her panic she didn't see the trap until it was too late. Before she fully knew what was happening, Bellamy's strong grip was keeping her from falling to her death. As she looked up at him she saw a spark of emotion in his eyes, a spark of fear, before he shut himself down again, helping the others to haul her back onto the ground without looking at her again.
When they returned to camp they went back to disliking each other. When Wells was killed, and Bellamy kicked the stool out from underneath Murphy, bowing to the pressure of a mob, Clarke was back to thinking she didn't know the former guard, and nor did she want to.
Until he tried to save Charlotte. She knew he blamed himself for Wells' death after he told Charlotte to 'slay her demons', and didn't want another of the 100's innocent blood on his hands. That was the night an agreement was made. They made the rules. Together.