Image Credit: Everett Collection; Alan Zenuk/USADiane: 5:35 pm, third floor, Time Inc. headquarters here in New York. I just got my hands on a red-hot scoop regarding Psych‘s forthcoming Twin Peaks-inspired episode.

Sources confirm to me exclusively that two ofPeaks‘ most iconic faces, Sheryl Lee (Laura/Maddy) and Sherilyn Fenn (Audrey), will appear in the episode alongside previously announced guest star Dana Ashbrook (Bobby). All three will play residents of Dual Spires (get it?), a quirky Northern California town that has been rocked by the death of a high school student.

But wait, there’s more…

Peaks‘ enigmatic Log Lady, Catherine Coulson, has signed on to make a cameo as—get this—the mysterious Woman with Wood, and Ray Wise (Leland) will reprise his season 4 Psychrole as Father Westley. Also popping up in cameos will be Peaks alums Lenny Von Dohlen (a.k.a. agoraphobic horticulturist Harold) and Robyn Lively (a.k.a. seductress Lana).

The episode—co-written by self-professed Peaks addict Roday—will air during Psych‘s fall run. The show’s summer finale airs tomorrow night.