Attempted murder? Inexplicable accident? Either way, a PTA mom struggled for her life in an elementary school cafeteria, poisoned by a wolfsbane-laced smoothie at the fifth-grade graduation party. Now all eyes are on the accused, the victim, and a woman hired to look deeper. Ambitious defense attorney and single mother Allison Barton is anxious to escape the shadow of the low-down dog of a marquee partner carrying their renowned Virginia law firm. A win for her high-profile new client will give Allison the career she deserves. And PTA president Kira Grant certainly appears innocent.

On a hot July morning on Sweden's idyllic vacation island of Sandhamn, a man takes his dog for a walk and makes a gruesome discovery: a body, tangled in fishing net, has washed ashore. Police detective Thomas Andreasson is the first to arrive on the scene. Before long, he has identified the deceased as Krister Berggren, a bachelor from the mainland who has been missing for months. All signs point to an accident - until another brutalized corpse is found at the local bed-and-breakfast.

At the grisly murder scene of a teen prostitute, Virginia state trooper Riley Tatum's past roars back to haunt her. When she was a teenage runaway, she was kidnapped, drugged, and left unconscious on the streets. She has no memories of what happened, only strange recurring dreams of two men playing cards. Former FBI agent Clay Bowman, Riley's old flame, is Shield Security's newest member. He's plagued by the unsolved case of a serial killer nicknamed the Shark who murdered girls as part of a sadistic poker game.

Alex Mahan is married to his high school sweetheart, Taylor. They have two daughters and a beautiful home, and Alex’s startup business is about to explode thanks to massive private funding from his compassionate and supportive father-in-law, Joe. With millions more to come, all is perfect - until Joe is abducted and murdered during a family trip in Mexico. 

Psychologist and criminologist Dr. Gretchen White is a specialist in antisocial personality disorders and violent crimes. She’s helped solve enough prominent cases for detective Patrick Shaughnessy that her own history is often overlooked: Gretchen is an admitted sociopath once suspected of killing her aunt. Shaughnessy still thinks Gretchen got away with murder. It’s not going to happen again.