A Discovery of Faeries - The Immortal Brotherhood, #2

When Noah Mason's boss ventures into Faerieland and doesn't return, he figures he ought to get her back before apocalyptic chaos reigns. Lady Arabella is the only person on earth who can open and shut doorways to the mythical land of magic and terror, and if her power falls into the wrong hands, everyone's screwed. But, he's not going alone. The raven-haired Raina Black with her powerful Seer Stone is by his side, joined by Chinonso the Reaper and Thomas the Time Traveler.
Unfortunately, they all must tolerate Raina's double-crossing sister Trixie, as well.  After her brush with dark magic, they don't trust her to be left alone, and her gift with sorcery may come in handy. In this second installment, the Immortal Brotherhood faces down otherworldly creatures, trying not to bring on the wrath of the Faerie Queen, while also outmaneuvering  a secret society seeking to possess powers never meant for men.
Throw into the mix a bloodthirsty serial killer with dangerous magic at his command, and the Brotherhood has their work cut out for them.