Marcia Muller and Bill Pronzini: Beyond the Grave (2011)

From the Publisher:
The bestselling author of "The McCone Files" teams up with the creator of the "Nameless Detective" for a collaborative mystery that bridges the San Franciscos of 1894 and 1986. Muller and Pronzini masterfully parallel the investigations of turn-of-the-century detective Quincannon and Chicana amateur sleuth Elena Oliverez. Detective Elena Oliverez decides to continue an unresolved investigation by the long-dead John Quincannon and finds that her life is in danger.

Marcia Muller and Bill Pronzini: Beyond the Grave. A John Quincannon Mystery. Speaking Volumes, LLC, ISBN: 9781612321196 (June, 2011), 235 p., $14.95, eBook $12.99.

Marcia Muller and Bill Pronzini: Beyond the Grave (1999)

From the Publisher:
The bestselling author of The McCone Files teams up with the creator of the "Nameless Detective" for a collaborative mystery that bridges the San Franciscos of 1894 and 1986. Muller and Pronzini masterfully parallel the investigations of turn-of-the-century detective Quincannon and Chicana amateur sleuth Elena Oliverez.

Marcia Muller and Bill Pronzini: Beyond the Grave. Carroll & Graf, ISBN: 0786706503 (May, 1999), 240 p., $5.95.