It’s a meeting of supernatural royalty: James Marsters, best known for his role as Spike on Buffy the Vampire Slayer, has been cast to narrate Cassandra Clare’s next audiobook, EW can announce exclusively.

Marsters will perform Lord of Shadows, a Shadowhunters novel. “One of my biggest inspirations for creating the Shadowhunters was always classic urban fantasy like Buffy,” Clare tells EW, “and it’s an honor and a bit of a trip to have my favorite character, Spike, read Lord of Shadows.”

Marsters joins a long list of Clare’s all-star Shadowhunters narrators, which includes Outlander’s Sam Heughan, The 100’s Devon Bostick, and How to Get Away with Murder’s Jack Falahee.

The novel’s official summary and audiobook jacket are below. Lord of Shadows will be released May 23.

Emma Carstairs has finally avenged her parents. She thought she’d be at peace. But she is anything but calm. Torn between her desire for her parabatai Julian and her desire to protect him from the brutal consequences of parabatai relationships, she has begun dating his brother, Mark. But Mark has spent the past five years trapped in Faerie; can he ever truly be a Shadowhunter again?

And the faerie courts are not silent. The Unseelie King is tired of the Cold Peace, and will no longer concede to the Shadowhunters’ demands. Caught between the demands of faerie and the laws of the Clave, Emma, Julian, and Mark must find a way to come together to defend everything they hold dear—before it’s too late.