Twillyweed

When an Irish orphan comes to live as an au pair on Long Island, she encounters a deadly mystery--and will need the help of her sleuthing aunt Claire.

One of the first things Claire Breslinsky loved about Johnny was that he never even glanced at her sister. Carmela had always been the glamorous one, but Johnny only had eyes for Claire--the frazzled, world-traveling photographer who solved mysteries in her spare time. Only when their marriage fell apart did Claire learn that Johnny avoided Carmela because they'd had a clandestine fling in high school. When Carmela discovered she was pregnant, she fled to Ireland, where she left her daughter to be raised by her eccentric spinster aunts. Now Johnny is gone forever--but Claire's niece is coming home.
 
Jenny Rose Cashin arrives from Ireland to take a job as an au pair in a fading Long Island resort town, hoping to reconnect with her long-lost mother. But something evil lurks in the quiet beachside residences of Sea Cliff. There is a killer on the grounds of this strange art colony, and Jenny Rose will need all the help she can get from her aunt Claire to uncover the truth--and stay alive.