Newly orphaned seventeen-year old Marin accepts a nanny position for an acclaimed horror writer and her mother's childhood friend, but she soon realizes all is not well at Lovelace House and must unravel its secrets before they consume her.

A blast of wind, a house-rattling bang, and Mary Poppins arrives at Number Seventeen Cherry Tree Lane. Quicker than she can close her umbrella, she takes charge of the Banks children--Jane, Michael, and the twins--and she changes their lives forever.