Sheila McCloud returns to Doylan Hall to mourn her aunt, convinced the woman didn’t simply slip from the cliff paths she walked with absolute certainty. A hidden medallion and a set of troubling letters push Sheila into a search for answers through fog that hides more than it reveals, drawing the attention of a killer who has already struck twice. Brian, the fiancé she once trusted without hesitation, reenters her life with gentle reassurances that now carry a chill. As secrets surface, Sheila knows with terrifying certainty that she'll be the next to fall from the cliffs of death.