Fortress

Derk is beginning to establish a formidable force to challenge the Demigods, but his estranged mother-in-law is plotting to stop him by assembling her own army. As he and his wives navigate a perilous desert filled with mysteries and dangers, they seek a legendary stronghold built for such a moment—where hidden secrets could alter everything. With their journey fraught with threats and discoveries, this installment continues the epic saga in the longest book of the series to date.