The Gatekeeper's Curse Series by Emma L. Adams

In a world of magic, being non-magical can get you killed. Ilsa Lynn has made it her life's goal to avoid the curse that binds her family to serve the Summer Court of Faerie. With her magically talented twin sister given the role of Gatekeeper, Ilsa is content to hide under the radar among the regular humans... moreIn a world of magic, being non-magical can get you killed. Ilsa Lynn has made it her life's goal to avoid the curse that binds her family to serve the Summer Court of Faerie. With her magically talented twin sister given the role of Gatekeeper, Ilsa is content to hide under the radar among the regular humans. At least until a mysterious spellbook falls into her possession, granting Ilsa with a sudden and inconvenient affinity with the dead, and dangerous magic that paints a neon target on her head. With her family's questionable past quite literally refusing to stay buried, the last thing Ilsa needs is an untrustworthy self-proclaimed faerie bodyguard, even if he does come with a deadly skillset of his own. Dealing with zombies and fae assassins would be difficult enough on its own, but now someone's out to frame her for murder, too. While dodging enemies at every corner, Ilsa must get a handle on her new powers before the armies of Faerie invade Earth. She might just be in over her head... less

Ilsa Lynn has survived her first few weeks as Gatekeeper between mortal and spirit worlds, but her problems are just beginning. The source of her magic remains as shrouded in mystery as her family's past, while the necromancers are keen to recruit her as one of their own. And then there's River, the tempting faerie-necromancer, placed in charge of her training... moreIlsa Lynn has survived her first few weeks as Gatekeeper between mortal and spirit worlds, but her problems are just beginning. The source of her magic remains as shrouded in mystery as her family's past, while the necromancers are keen to recruit her as one of their own. And then there's River, the tempting faerie-necromancer, placed in charge of her training. Keeping her abilities quiet seems impossible with wraiths haunting her every step, let alone an estranged family member with a secret of his own appearing on the doorstep. When a dark evil sets its sights on her family, it'll take everything Ilsa has to lay the spirit to rest before she ends up six feet under -- permanently. less

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... moreIt'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... less