It's time for the Gatekeeper's final stand... The Lynn siblings might finally be reunited, but now their mother is held captive in Faerie and their family's magic is fading, Ilsa holds the key to saving both realms from total annihilation. With allies in short supply and the Summer Court refusing to believe the threat they face is real, it's up to Ilsa to dig into her family's past to find the truth of the Gatekeeper's curse. Enemies old and new are gearing up to take out the Gatekeeper and claim her power, and even the help of the legendary faerie killer Ivy Lane might not be enough...