Mesmerized by Gayle Lynds

Ambitious and brilliant Washington attorney Beth Convey suffers a heart attack during a high-profile trial, but is saved by a transplant. When she recovers, she is shocked to find she has received more than a new heart. She has remarkable new abilities and tastes, and most disturbing of all, vivid dreams of terrifying violence. Desperate to find the truth behind her new self, Beth embarks on a search for an unknown donor and soon joins forces with Jeff Hammond, a disgraced former FBI agent. Now a prize-winning investigative journalist for the Washington Post, he is on the trail of a Soviet defector who has gone missing in the Washington area. Meanwhile, in the Department of Justice, three frantic officials are secretly trying to find the mole who has compromised American intelligence. 

Cellular memory influencing transplant recipients was an interesting idea. Lots of red herrings, with the final one one just a bit too far. Kept me turning the pages to find out how long it would take for those in charge to look beyond the obvious.