"The Law of Lines follows the parallel stories of two young women whose lives are upended by sudden loss. When Se-oh, an agoraphobe still living with her father, returns from an errand to find their house in flames, wrecked by a gas explosion, she is forced back into the world she had tried to shut out. The detective investigating the incident tells her that her father caused the explosion to kill himself because of overwhelming debt she knew nothing about, but Se-oh suspects foul play by an aggressive debt collector and sets out on her own investigation, seeking vengeance. Gijeong, a beleaguered high school teacher, receives a phone call that the body of her younger half-sister has just been found. Her sister was a college student she had grown distant from. Though her death, by drowning, is considered a suicide by the police, that doesn't satisfy Gijeong, and she goes to her sister's university to find out what happened. Her sister's cell phone reveals a thicket of lies and links to a company that lures students into a virtual pyramid scheme, preying on them and their relationships. One of the contacts in the call log is Se-oh."-- Provided by publisher.