In Older’s sequel to Shadowshaper (2015), Sierra Santiago has grown in her shadowshaping powers but feels overwhelmed by her new role as Lucera, head of Shadowhouse. One night in Prospect Park, a girl from school gives Sierra a creepy playing card and a dire warning about a coming conflict. At first she thinks nothing of it, but the card is part of the Deck of Worlds and reveals that the four major houses are locked in a power struggle. Unbeknownst to Sierra, she and her shadowshapers are one of those houses and the Sorrows are out to get them once more. Caught in the middle of an ancient struggle with old and new enemies, Sierra will have to call upon all her shadowshaping skills to protect herself and those that she loves.