If She Only Knew: A Riveting Novel of Suspense (The Cahills Book 1)

If She Only Knew: A Riveting Novel of Suspense (The Cahills Book 1)

by Lisa Jackson

4.3 (13,422)

4.3 stars from 13,422 reviews. One of the highest rated Mystery Thriller books we track.


$3.99KU60% off peak

Last checked: Jun 11, 2026

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Fans of these authors will like this...

  • Colleen Hoover
  • Tana French
  • Simone St. James

Fans of these books will like this...

  • The Silent Patient
  • Then She Was Gone
  • Verity

Perfect for you if...

  • You love psychological thrillers where the protagonist can't trust anyone around them, including their own family.
  • You're drawn to mysteries where the main character's identity itself becomes the central question.
  • You enjoy fast-paced page-turners with unreliable narrators and shocking twists that reframe everything you thought you knew.

Maybe not for you if...

  • You prefer character-driven literary fiction over plot-driven suspense.
  • You need your protagonists to be likeable and relatable from page one.
  • You find amnesia plots contrived or overused as a narrative device.

About this book

If She Only Knew introduces the Cahills, a wealthy San Francisco family marked by hidden secrets and conflicting agendas. At the center of their world is Marla Cahill, a woman who awakens with no memory of her identity, past actions, or why she might be in danger. The story begins on a dark northern California highway, where two vehicles collide—one driver dies, and the other falls into a coma. When the surviving woman regains consciousness, her memory is gone and her face has been surgically reconstructed. Her family identifies her as Marla Cahill, though she recognizes none of them. Recovering in an isolated San Francisco mansion, Marla waits for her memory to return, but instead experiences a persistent sense that she is not who everyone claims and that something is deeply wrong. As Marla's fear intensifies, she becomes convinced her life is in danger. A killer watches and waits for the moment when Marla's memory returns.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$5.00$9.99Mar '21Aug '23Dec '24Dec '25
$1.99$9.99

Currently on sale at $3.99 — 60% off peak. Price has dropped 19 times over the last 5 years. Goes on sale roughly every 103 days. Typically stays discounted for 31 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#101#32,037#63,973Mar '20Apr '22Nov '23Jun '26

Currently around #14K in the Kindle store — a steady mid-list seller. Climbing the charts — 37% improvement recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

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3.5★4.3★5.0★May '23Mar '24Jul '24Feb '26RatingReviews

Currently 4.3★ from 13,422 reviews

Gaining approximately 137 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.3 over the tracking period.

Sale Prediction

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Free$5.00$9.99Mar '21Aug '23Dec '24Dec '25PredictedJun '26

Actual Predicted

This book is currently discounted at $3.99. It typically returns to around $9.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Lisa Jackson

1 book on Vagrant Press

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