Siete espinas mortales

Viola Sinclair has spent her entire life hiding her magic. If it's discovered, she'll be killed, because in the kingdom of Aragoa, dark magic is forbidden. When Viola's secret reaches the queen's ears, she sends an assassin to kill her. And she marks him with a cursed tattoo: seven thorns on his arm, symbolizing the seven days he has to complete his mission. If he fails, he will be the one to die.