Keri Arthur - Dark Angels (#1-7)

Darkness Unbound (Dark Angels #1)
Risa Jones is as extraordinary as her heritage. Born from a lab-enhanced clone mother and an Aedh father, she can not only talk to the souls of the dying and the dead, but she can see the reapers and walk the gray fields that divide this world from the next.

They are skill she rarely uses, however, preferring to concentrate on the business she shares with her two best friends. But when her mother asks her to help the parents of a little girl locked in a coma, she reluctantly agrees. What she discovers scares the hell out of her. Because the little girl’s soul no longer resides in her body, and it wasn’t death and the reapers that took her.

Someone had ripped her soul from her flesh.

As it turns out, a creature consuming the souls of the innocent–and not so innocent–is the least of her problems.

Because someone wants to rip open the gates that divided hell from earth, and Risa is a key component in their plans.

And the only person standing between her and disaster is a reaper who isn’t exactly on her side.

Darkness Rising (Dark Angels #2)
Risa will go to any lengths to avenge her mother’s murder—even if it means making a pact with the most evil vampire she’s ever met. Lethal and powerful, Madeline Hunter is leader of the vampire council, and will put her resources behind finding the killer—for a price. The venerable vampire requires the assistance of Risa’s psychic powers. Quid pro quo.

Someone—or something—is targeting the elders of the local council, cursing the immortal vampires to rapidly age, sink into madness, and die. Risa must track down the vengeful being responsible. But Risa’s father, a rogue Aedh priest, also enlists her in a dangerous mission. And not even the great Madeline Hunter may be able to protect her from the shadowy forces that desire nothing less than Risa’s destruction.

Darkness Devours (Dark Angels #3)
Half-werewolf, half-Aedh Risa Jones can enter the realm between life and death, and she can see the Reapers who collect the souls of the dead. Now, she is using her gifts—and the investigative know-how of a man who broke her heart—to find a cabal searching for the power to control time, reality, and fate. And this is besides her work for the Vampire Council, half of whom want her dead.

But for now the Council needs her alive. Someone is killing blood-whore addicted vampires, and Risa must find the guilty party. If she succeeds, she may finally convince the council to lift the execution order on her life. But before she succeeds, she must first survive.

Darkness Hunts (Dark Angels #4)
Risa Jones, half-Aedh/half-werewolf, can enter the realm between life and death. She can speak to the dying and the dead, and she can see the reapers, collectors of souls. What she can not yet see is the identity of a stranger murdering women and draining their blood. Now Risa must summon her gifts to find him, even if it means putting her own life in danger. But Risa needn't look far. The killer knows who she is.
He tells her his victims are infected by darkness and he's fated to destroy them. Fascinated by Risa, he engages her in a sinister game: the chance to save the life of his next victim by deciphering his series of clues. In a race against time, she enlists the help of the reaper Azriel.
But as an attraction between them grows, so does the fear that the stranger's motives are only part of a larger, more dangerous stratagem--one that that has lured Risa and Azriel into the dark.

Darkness Unmasked (Dark Angels #5)
Shortly after her fight on the astral plane, Risa receives a phone call from Madeline Hunter, the leader of the vampire council, ordering her to investigate the death of Hunter's close friend and lover - Wolfgang Schmidt. His body has been discovered wrapped in a web-like substance and has been completely drained. As the body count continues to grow, Risa must summon her gifts to find the dark spirit before it strikes again.

Meanwhile, as the search for the keys that keep the gate to Hell closed grows more intense, Risa begins to unravel mysteries that will have startling consequences for her.

Darkness Splintered (Dark Angels #6)
Risa has angered several powerful people, and she’s starting to feel the pressure from all sides. She also finds herself under the scrutiny of the vampire council, some of whom consider her a monster who should be destroyed. But they offer her a bloody bargain: Take on the lethal head of the council and others will support her.

As the search for the keys to hell heats up, Risa realizes that she has no choice. For the sake of the people she loves, she must find the keys—and get rid of Hunter—before the next gate is opened and brings the world closer to all hell breaking loose.

Darkness Falls (Dark Angels #7)
The search for the last key to the gates of hell has begun, and half-werewolf, half-Aedh Risa Jones is in more danger than ever—and one misstep could prove ruinous. It's only a matter of time before Madeleine Hunter, the dangerous head of the vampire council, begins her hunt for complete domination. And for Risa, that comes with an alarming ultimatum: hand over the last key to Hunter or, one by one, her loved ones will die.

Now, it’s a race against time for Risa to save those she loves, and to stop Hunter's apocalyptic plan to open the very gates of hell.