Twenty years ago, Tallia Bachman vanished at Clearwater Lake, presumed drowned. Now, eerie screams echo across the water at night, and a ghostly figure in white haunts the shoreline.

Gertrude Gumshoe isn't buying it. Armed with her trusty walker, her stubborn determination, and a reluctant Calvin in tow, she's convinced there's a flesh-and-blood explanation behind the so-called hauntings. Someone has a motive for scaring the locals—especially Carlotta, who refuses to sell her lakeside property to developers.

As Gertrude investigates, she'll confront mysterious midnight singers, dodge suspicious SUVs, and even take her first-ever airplane ride. She might have to get soaked to the skin and risk being the lake's next victim, but this amateur detective won't rest until she uncovers the truth... if her snack supply holds out.