This is one of the Artist's Proofs sold by Stan directly to his fans at conventions.

"This is number 21AP of 350 copies of the hardcover edition ... each of which has been individually signed and numbered by Stan Sakai." It has a bound-in limitation page with an exclusive color illustration and Stan has drawn a small Usagi headsketch next to his name.

Collects Usagi Yojimbo Vol. 3 issues 23-30, plus a cover gallery. Introduction by Max Allan Collins.

From the publisher:

Grey Shadows shows off Stan Sakai's amazing versatility in story telling. Featuring alongside Usagi, introduces the police detective Ishida who helps solve a string of exciting murder mysteries.

Fresh from winning the Best Serialized Story 1999 Eisner Award for Grasscutter, Stan Sakai returns with a new Usagi Yojimbo collection featuring six tales of the ronin rabbit's journeys and adventures in feudal Japan. "My Father's Swords" retells an encounter with a young samurai who follows in-and is followed by-the footsteps of his father's warrior heritage. In "The Demon Flute," a village is plagued by a music-playing supernatural killer. Usagi recounts a classic Japanese folk tale in "Momo-Usagi-Taro." Two Tokugawa-era whodunits play out in "The Hair Pin Murders" and Tameshigiri," a pair of Inspector Ishida mysteries. Usagi becomes entangled in a conspiracy to overthrow a lord's throne in "The Courtesan." Memory, mystery, and treachery intermingle to form Grey Shadows.