Who can you trust when you can’t trust yourself?

The pregnancy podcasts warned Joanna Baker about the baby blues, but when a near-fatal mistake places the first-time mom under the watchful eye of Child Protective Services, she receives a serious diagnosis.

Postpartum depression. Jo hears the words, yet they don’t make sense. Nothing does. Her blackouts are increasing, and she can’t recall events she’s been accused of.

As she fights to keep her daughter, she discovers cracks in her neighborhood, family, and her own home. With the support of her sisters, she attempts to piece together her traumatic past and uncover who is truly in control.

Jo must battle her faltering mind to save what’s most important—her daughter.

Brianne Sommerville is a Canadian thriller author. She studied English literature and theatre before entering the world of public relations and marketing. She lives in Toronto with her partner and three littles under five and knows every episode of Peppa Pig by heart. If I Lose Her is her debut novel. Her sophomore novel, What She Left Behind, will be released in the summer 2025 with Rising Action.

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"Sommerville captures the bone deep fears of new motherhood with raw and poignant accuracy. Using the landscape of a mother’s sleepless nights and pressure for perfection coupled with a strained marriage and her own dysfunctional family past to create an edge of your seat thriller in which everyone is a threat to her child, possibly even, herself." - Best selling author of What You Never Knew, Jessica Hamilton

"Debut author Brianne Sommerville makes a splash in the thriller genre with her captivating, compelling IF I LOSE HER. I flew through this riveting, suspenseful story of a new mother whose past traumas might be unraveling her current reality, or someone else could be pulling the strings. As the list of suspects grows, Sommerville beautifully balances a woman trying to figure out who's putting her child in danger with a deep, raw look at motherhood, marriage, and family that skyrockets in intensity on every new page. A fantastic read!" - Samantha M. Bailey, USA TODAY and #1 national bestselling author of A FRIEND IN THE DARK