When news arrives that Emperor Daican has been in contact with his chief war strategist, it signals potential doom for the country of Samara. Determined to intervene, the resistance in Landale, headed by Lady Anne, embarks on a covert mission in hopes of unearthing further information. However, a shocking discovery leads to complications no one could have foreseen.

Armed with their newfound knowledge, they set out for Samara to warn the king. War is inevitable, and they must face two desperate battles-one on the walls of Samara's great stronghold and the other on the battlefield of Jace's heart, where victory might only be achievable through great sacrifice.