On her 19th birthday, Princess Kelsea Raleigh Glynn sets out on a perilous journey back to the castle of her birth to ascend her rightful throne. Around her neck hangs the Tearling sapphire, a jewel of immense magical power; and accompanying her is the Queen’s Guard, a cadre of brave knights led by the enigmatic and dedicated Lazarus. Kelsea will need them all to survive a cabal of enemies who will use every weapon to prevent her from wearing the crown.