Night Sins by Tami Hoag Book

Written in 1995. Some yellowing on inside due to age. Someone’s name is written on the inside.
A peaceful Minnesota town, where crime is something that just doesn’t happen, is about to face its worst nightmare. A young boy disappears. There are no witnesses, no clues—only a note, cleverly taunting, casually cruel. Has a cold-blooded kidnapper struck? Or is this the reawakening of a long-quiet serial killer?
A tough-minded investigator on her first, make-or-break case . . . A local cop who fears that big-city evils have come to stalk his small-town home . . . Together they are hunting for a madman who knows no bounds, to protect a town that may never feel safe again.