The Infernal Devices, by Cassandra Clare

When a seventeen-year-old Tessa leaves New York to find her older brother in London after their aunt dies, she's abducted by the dark sisters and tortured into learning about a power she never knew she had. Little does she know that a terrifying mastermind plans to use her power to destroy the entire race of Shadow Hunters, known as the Nephilim. I absolutely loved this trilogy. The setting, the plot, the narrative style, and the characters were brilliantly done. I especially loved the characters, which were amazingly distinct despite a large cast. My favorite characters were Tessa, Will, and Jem. They were all three so good, that you couldn't help but love them. All three books also continued to add new twists and turns to the story. Even the Epilogue of the last book has a surprising twist, and I loved it! I highly recommend this series to young and old alike.