The Unknown Son — K.J. Dahlen

FBI agent Sable Quinn has survived several attempts on her life by members of the Reardon family, serial killers with a link to her own past. Now another family member has surfaced, an UNKNOWN SON determined to murder Sable where others have failed.

But Noah must let Sable live long enough to reclaim a fortune in stolen money, gold, and jewels. Unknowingly, Sable possesses the key to this fortune: an ivory handled knife taken as evidence in the murders of her family members.

With both her life and a fortune on the line, Sable fights her toughest battle yet. Will she survive the final showdown against the last serial killer of the Reardon family?