Devil's plaything

the long version

"Lily Idle carries a secret. But she can't remember it. She's in her 80s and suffers from dementia. That's too bad because one of the secrets she carries around inside her head is so dangerous that, unless it's exposed, it could change the world--much for the worse. Her grandson, Nate Idle, is a thirty-something investigative medical journalist, smart and witty but rough around the edges. Now he faces his toughest assignment ever: figuring out the secret inside his grandmother's head before a conspiracy goes deadly wrong."--Dust jacket.