Un squelette sous la mer (Pocket Book)

The sense of dread and suspense really stuck with me. I'm curious whether the author drew from personal experiences or specific horror influences.

Her fears and doubts felt so real, but at times I wondered if her reactions were exaggerated for the story. Would love to hear others' takes.

The layers of clues kept me guessing until the end. I'm wondering if the plot was plotted in detail from the start or if it evolved during writing.