Her parents met at the library. Jaymes was researching ancient history for a job as an ancient historian. He grew in love with the goddess through the pages of the book, every day returning to the library and praying she visit him. One day, she obliged, appearing in front of him. He was amazed and asked her to accompany him to a café. They talked, and she came to visit him more often. Eventually she fell in love too. However, Athena was a Virgin Goddess and wasn't allowed to have "it", so as a token of her love, she created children with the personalities of her and Jaymes, a brainchild.
Opal had a relatively normal childhood. Up until she was three, she didn't notice that she didn't have a mother, up until she was five she didn't know that other people did, and up until she was seven, she didn't care. She had a Twin sister called Tula, and a doting father. She went to a regular school, and despite having many reasons to bullied (ADHD, Dyslexia, and top of the class), nobody did, because the last person that tried, ended up in hospital. For some reason, though, Opal always had a connection with owls. Opals life was happy, and she would have been more than happy for it to stay that way.
But that was the calm before the storm.
Jaymes felt he was amazing, after all, he had caught the attention of a goddess! He didn't know about demigods, and thought he was the only one who had caught the attention of a goddess. He prayed to her every night, begging her to take him up to Olympus. Eventually, she returned to him, but refused, however, and Jaymes grew bitter. He decided to kill the girls as revenge, knowing his former wife loved them.
The week before their thirteenth birthday, Opals twin, Tula heard her father say into his phone "I don't care how you do it, I just want her dead!" Tula was terrified and begged her twin to run away with her, but Opal would have nothing of it.
On the day of her thirteenth birthday, Tula was killed. Opals father told Opal he had done it. He told her that if she wanted to live, she would admit to doing the crimes.
On the day of the trials Opal refused to admit to committing the crime, telling the truth.
Opal lived alone on the street for a year, avoiding police, as she didn't want to go to a foster home. She survived by begging and stealing.
Not long after she ran away, Opal was outside her make do home, when she was attacked by five stymphalian birds.She beat them off with a bit of old wood from her makeshift house and prayed to anybody who was listening. Nothing happened. She literally ran for her life. She heard a voice in her head. It told her to find the nearest library. It gave her directions too. She had no choice but to listen. She found it and walked breathlessly to the counter. She stated her name to the teenager behind it. The teenager, Ellen, gave her a ring with Athinaios carved into the back. Opal understood it to mean "Athenian". Ellen told her about camp, warned her that the birds had not been deterred, and handed her a wireless stereo and a CD. She told her to play it while fighting the birds. Opal went outside and took the ring off, on a hunch, and muttered "metaschimatismo", "transform, in Greek, also on a hunch. The ring turned into a long celestial bronze blade. She used it to beat off the birds as she turned on the radio. As soon as they heard the loud music blaring from the radio, they flew away.
Opal did not go to camp however, remaining on the streets, as she did not want to trust any body in case she got hurt again
However, James had a gift from his former wife, a scrying bowl type thing. He could only view the children with it, and was given to him so he could keep them safe. Apollo had warned Opals mother that bad things would happen to the girls, so she gave it to him to prevent anything bad from happening to them (Epic fail), and instead he was using it to harm her. He sent an assassin to kill her telling him her location.
Camp knew about Opal from Ellen (Who was a demigod child of Athena) and had sent a satyr to watch out for her. As soon as they heard about the assassin (they are children of gods, they know these things), they alerted the satyr, and he alerted her. They caught a taxi to close to camp (the satyr preferred not to give away the location of camp) and not far from camp, the assassin caught up. A good knock to the head solved that problem. It also gave him amnesia which solved the OTHER problem of the assassin seeing the satyrs goat hoof. Well, he didn't see it because of the Mist, but better to be safe than sorry. Anyway... It was fun.