Zero Day by Jan Gangsei

Addie Webster was eight years old when she was kidnapped from the governor's mansion. Darrow, her best friend, was the last person to see her. At the time, her dad was the governor. Now, eight year later, her father is the President of the United States, and Addie is back. She escaped her captors and is returned to her family to live in the White House.

So much has changed since Addie was taken. She has a sister who was born while she was away. Darrow is no longer the little boy she used to beat at games. Her parents have become very overprotective. They look at her like she could fall apart, but Addie kept herself alive for years without their help.

Around the same time Addie returns, terrorist attacks start happening in Washington DC, but with no injuries. Cerberus, the group taking responsibility, wants officials to see the flaws in their security systems before someone is hurt or killed.

To some, it is too much of a coincidence that Addie comes back at the same time that the attacks occur. Could they be related? Is Addie involved? It is only a matter of time before everyone is drawn into Cerberus' plot.

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