G5 and Serpent Creek have teamed up to bring 9 Clues: The Secret of Serpent Creek to the Mac. It's available on the Mac App Store.

Here's how the game is described: "Your closest friend, journalist Helen Hunter, traveled to the coastal town of Serpent Creek to report on the Serpent Festival. Now she's missing, and the last phone call she made was to you. As a paranormal private investigator, Helen wanted you to weigh in on some frightening things she'd discovered. She asked you to come immediately.
 
"The first thing you see upon arriving in Serpent Creek is a humanoid, snake-like creature. Clearly, Helen's fears were not groundless. It seems the town's streets are crawling with snakes, the ground shakes with violent tremors, people are sleepwalking and to make matters worse, no one remembers a blonde journalist. You'll have to investigate mysterious locations and solve challenging puzzles to piece together clues about what happened to your best friend. Reveal the evil that clutches this crippled town and stop a nefarious plot to bring the Snake God back to our world!"

You can try 9 Clues: The Secret of Serpent Creek for free and unlock the full version for US$4.99 though April 9.