The Blackbird Files Series by Heather Graham

In the shadows of a Scottish castle, something deadly is lurking in every corner…When FBI special agent Luke Kendrick discovers chilling evidence of dozens of victims at a crime scene in London, he recognizes the calling card of the notorious H.H. Holmes Society. Named for the nineteenth-century monster regarded as America’s first serial killer, the society is comprised of a twisted web of killers, working to carry out heinous murders in Holmes’s memory... moreIn the shadows of a Scottish castle, something deadly is lurking in every corner…When FBI special agent Luke Kendrick discovers chilling evidence of dozens of victims at a crime scene in London, he recognizes the calling card of the notorious H.H. Holmes Society. Named for the nineteenth-century monster regarded as America’s first serial killer, the society is comprised of a twisted web of killers, working to carry out heinous murders in Holmes’s memory. And now the group’s been linked to a Scottish castle turned B and B—where guests check in but never check out.Arriving at the sinister Graystone Castle posed as a tourist, Luke is joined by Special Agent Carly MacDonald, and the pair is immediately confronted by dangers hidden in the castle’s depths. With guests disappearing and a network of killers closing in, Luke and Carly have only each other to rely on—and they’ll have to race to cut off the head of the snake before the blood trail of the past can culminate in a very real and deadly present.The Blackbird FilesBook 1: Death Behind Every Door less

In the alleys of Edinburgh, someone is killing for profit…Scotland has a dead body problem. Another one. And in the wake of a similar spate of tribute killings, Special Agents Luke Kendrick and Carly MacDonald know they have their work cut out for them. Working alongside a new team of agents, the partners have more questions than answers when the crime scenes yield little evidence... moreIn the alleys of Edinburgh, someone is killing for profit…Scotland has a dead body problem. Another one. And in the wake of a similar spate of tribute killings, Special Agents Luke Kendrick and Carly MacDonald know they have their work cut out for them. Working alongside a new team of agents, the partners have more questions than answers when the crime scenes yield little evidence. In the style of infamous killers Burke and Hare, it appears victims are being moved to a secondary location, where they’re dissected and sold for spare parts.With the clock ticking on every organ being harvested, the members of Blackbird know the killers must be near at hand, and soon discover that they’re also being closed in on. As questions begin to arise about the newest additions to their team, Luke and Carly are running out of time—and people they can trust—to catch the killers before the agents themselves are the next to be put on ice.  The Blackbird FilesBook 1: Death Behind Every Door less