Harry has been married to Ginny for some time. After their first child had been still born, they somewhat ended up distanced from each other. After the war, he didn't really know what to do with himself.
When Ginny tells Harry that she is pregnant from her lover, wants a divorce and his money, he strikes back. For the first time in quite a while, he's furious, he can't keep his magic back nor does he want to.
If Ginny wants to play dirty, he will give her a game.
Hermione recommends Harry Draco Malfoy who has become the most famous arguer in divorce cases.
Draco Malfoy is fascinated by Harry's magic and takes up the case. Their side is actually a lot better since Ginny and her lover Blaise do not have the money to get an arguer.
It seems to be an easy game for Draco to get through their demands. During their time together, he develops urges for Harry.
Ginny's money greed and Blaise's readiness for unfair and even cruel methods leads to the fact that they attack Harry. Harry then moves in with Draco, his arguer, for protection. Soon after, Lucius appears and tries to kill his son. Apparently, Blaise paid him to come back from his exile.
Harry then realizes that he has similiar feelings for Draco.
Not that the scheming becomes less. Ginny claims that the baby has a sickness and wants Harry to pay for the treatment. Harry is not heartless but he feels betrayed and she asks for too much, for humiliation instead of compensation.
When Blaise abducts Draco's mother, Ginny asks Harry to save her. She is afraid of Blaise.
When Blaise is out of the picture and Draco's mother rescued, Ginny has to stay with Blaise's mother who is crazy for money. Apparently, it's in the family to seek out those who can give money and kill them.
Because Ginny was shamed by her money greed and her choice of lover, Harry wins the case. He still has to find a solution with the Weasley's who have been divided in their opinions over the divorce.
Harry makes it clear that he and Ginny are not suited for each other.
Draco and he are happy together.
Practicing Liars, and its sequel: Volatile
A reckless frame of mind, and its sequel, A determined frame of mind