Up to eight guests can take part in an interactive murder mystery dinner Sept. 11 inside a 14,000-square-foot mansion on the slopes of Mount Tamalpais.

Marin Theatre is hosting “Murder at the Bloodwood Masquerade Ball” from 5:30 to 9 p.m. Friday, Sept. 11, at the Ralston White Retreat, 2 El Capitan Ave. in Mill Valley. Tickets cost $175 per person, with proceeds supporting Marin Theatre, according to the event’s Zeffy ticketing page. Seven spots remained as of Aug. 25.

The evening is capped at eight participants. Guests are welcomed with drinks and introduced to the fictional town of Bloodworth Falls, where an anonymously delivered invitation draws them into a masquerade at Bloodwood Castle. Over dinner, guests take part in the mystery and may find themselves playing the victim or murderer. Costumes are encouraged.

The venue itself sets the mood. Designed by celebrated San Francisco architect Willis Polk, whose firm helped rebuild the city after the 1906 earthquake, the mansion was built between 1911 and 1915 as a wedding gift from Ralston Lovell White to his bride, Ruth Boericke. White named the estate “The Garden of Allah” after his favorite novel. Construction materials were hauled up the mountain via the old Mount Tamalpais Railway, and the home was built with a steel-beam structure intended to make it earthquake-proof.

The three-story home sits on 43 acres, with nine porches and balconies, a heart-shaped lawn, walking paths and trails connecting to the summit of Mount Tamalpais. It is operated by the Ralston White Retreat Foundation, a nonprofit whose rental fees support preservation of the property.

Marin Theatre described the retreat as a “stunning historic mansion” and joked that it is “certainly not haunted,” calling it a fitting setting for the masquerade-themed evening.

Residents can check the Zeffy ticketing page for current availability and visit marintheatre.org for more information.