Happiness Falls - Angie Kim

Mia Parkson's life is turned upside down when her stay-at-home dad, the family's anchor, goes missing. The only witness? Eugene - her younger, nonspeaking teenage brother.
As the Police struggle for leads, and her mother and twin brother struggle to keep things together at home, Mia gains access to key clues about her father's disappearance. Headstrong, hyper analytical, and with secrets of her own, she decides to try and solve the case. But could Mia's impulsive actions be putting her whole family in danger?