Now You See Her by James Patterson & Michael Ledwidge

Now You See Her - Nina Bloom is a successful lawyer in New York City, her daughter, Emma, has just turned 16 and is asking about her father.  Nina has kept Emma in the dark about her past because Nina has been on the run from her husband who is a bad cop in Key West.  But now Nina returns to Key West to clear an innocent man of murder charges and she has to face her past.