Click by Jean Knight Pace: 

When twins, Joel and Eli, wander off school grounds to play an interactive game on their phones, their mother punishes them by taking away their phones until they complete a 200-piece puzzle. Seems easy enough. Except that it’s not a normal puzzle. Created and hand-painted by a local artist, the puzzle pieces are hidden throughout the town.

But then the artist who created the puzzle turns up missing.

When bodies start surfacing in a local pond, and the twins’ mother takes in a foster girl who spends most of her time drawing–making pictures of the same things that are in the puzzle only with precise and elaborate details, the twins begin to wonder if piecing together the puzzle will mean more than just getting their phones back.

 

Every Thirteen Years by Jean Knight Pace:

Every thirteen years in the month of May, a child disappears in the woods. And this is the year.

Which means there’s a strict rule against any children or teens going into the woods. Which means the parties start almost immediately. Which means that when Hans sneaks out to attend the final one on May 31st, his little sister follows him.

Which means things are going to get bad.