What shines in darkness

The main character works as an assassin together with another woman. She does, however, have a great need for another life and finds glimpses of this with her best friend when they take long, quiet walks in the forest. They have a solid friendship though they know very little about each other. Her best friends is a police detective, and she gets the main character's last kill on her desk, not knowing who the killer is. Knowing that the main character is single, the best friend arranges a meeting with a single, male friend of hers. They spend the night together. In the meantime, the police have found the main character's and the other assassin's apartment and her partner in crime escapes and meets up with the main character, demanding her to erase all tracks, killing her new lover and her friend. Pointing a gun at his face she cannot force herself to pull the trigger. Instead, they become a tighter couple and when the best friend comes to arrest her, they both run. They aim for a new, free life together. The main character and the best friend have a solid friendship separating action from character, and they remain friends. Though she will risk getting arrested the main character invites her best friend, the cop, to her wedding ceremony with their common acquaintance. Her former partner in crime does not, however, accept these events of things and turns up at the wedding kidnapping them all. The main character gets their kidnapper under gunpoint but chose not to kill. Instead, she gets arrested together with her former partner in crime.