The Invisible Woman — James Patterson; Susan DiLallo

Elinor Gilbert is the Invisible Woman -- but not the kind who can walk through walls.  

Former special agent Elinor Gilbert has disappeared from law enforcement. She hasn't been on a case in years -- until her old FBI boss offers a special surveillance detail.

The target: An art dealer suspected of ties to organized crime.
The location: A ritzy New York mansion.
The assignment: An undercover gig…as a grandmotherly live-in nanny.

Elinor is torn. Detective work comes naturally to her. Babysitting (kiddies and canines) does not.
But as she investigates, Elinor discovers why a person living in the shadows might want to reappear. 

Part crime thriller, part hilarious social satire, The Invisible Woman is the story of a sleuth in search of herself.