From publisher blurb:
Tick Tock is a short murder mystery adventure for four to five 9th-level characters and primarily features exploration and combat. Scaling options are provided for weaker or stonger parties.
As his age grew, Dwor Methian became obsessed with avoiding death. To that end he retired into the woods and quietly devoted his fortune and all his efforts toward controlling time, hoping to manipulate his personal timeline and cease aging. Mastering arcane magic and gathering items of power, he eventually managed to capture the Vozmonzal, a fragment of living time spawned of a dead and forgotten god. Unfortunately, the magical clock that he crafted to control the creature captured him as well, leaving his isolated cabin empty… until now.
The adventure features a time mephit, a time elemental, and Vonmonzal - a CR 13 large elemental with legendary actions.