The White Crow Chronicles - The Lonsdale Files, #3

Traumatized and disillusioned from his internship with the FBI, Aidan Lonsdale has sworn off a career in law enforcement. Now, he spends his days as a private investigator, taking mundane cases to pay the bills and keep his loved ones safe. But everything changes when Aidan receives a strange call one night from a mysterious new client. When she presents him an offer too good to refuse, Aidan makes the fateful decision to accept her case. As he'll soon learn, there's far more to this client's request than what meets the eye.
By accepting the case, Aidan will find himself heading down a long, dark rabbit hole - one leading him back into the dangerous world he'd tried so hard to escape.