Hide-and-seek

One, two, buckle my shoe...
The nursery rhyme echoes over the reeds of the lake.
Three, four, shut the door...

A body is discovered in the water.
Thirty years later, a woman is haunted by a series of anonymous messages repeating the same rhyme. Time is running out.

Investigators Naia Toulin and Mark H. take on the case to find the missing woman. But when they discover connections to an unsolved cold case from decades ago, their investigation takes a terrifying turn.

A twisted killer is at large. Can they catch him before he strikes again?