Once our world was full of dragons who lived in harmony with humans. But after a group of rogue dragons, the Raptors, tried to take over Earth, all dragons were banished to another realm.
Most humans forgot about the dragons, claiming they never existed. Eleven-year-old Sirin knows the truth — she grew up with stories passed down through the generations. However, when her mother falls ill, even Sirin has trouble believing in magic... until she sees a mysterious streak of silver in the night sky.
Sirin becomes the first child to "lock" with a dragon in centuries — forming a deep friendship unlike anything she's ever imagined. But Sirin learns that not all dragons returned with good intentions, and soon she finds herself at the center of a battle between the dragons who want to protect the humans... and those who want to destroy them.
