One princess. One assassin. One switch that puts both their lives at stake.

Azurem is one of four kingdoms ruled by guardians of magic. On the day that Princess Magdalena is to be crowned, she discovers that she wields a different, more volatile power than her father, calling into question the legitimacy of her birthright. The crown she was born to wear now hangs in the balance – and her new magic must remain a secret or else risk igniting a battle for the throne.

Ever since she was a child, Dagmara served the royal family of Azurem. As the most lethal and covert royal assassin, her job is a means to provide a better life for her brother. However, when Princess Magdalena's father is killed, Dagmara begins to suspect the infamous Mad King – a man known for his terrorizing reign in an enemy kingdom.

When Princess Magdalena receives a marriage proposal from the Mad King, the girls devise a plan to switch places. Princess Magdalena investigates her newfound powers on a quest full of romance, secrets, and espionage, while Dagmara goes undercover as the Mad King's betrothed to bring him to justice once and for all. As Dagmara delves into the Mad King's involvement in the murder, she catches the eye of his suspicious and handsome captain, a man that embodies danger and desire. Caught between her heart and her blade, Dagmara must navigate politics and ancient clues that bring her closer to the truth – a truth that could unravel the fabric of the kingdom she has bled to protect.