The newest audiobook collaboration between Marvel and Serial Box features super-spy Black Widow as she goes on a quest to retrieve a vial of her blood.

The 14-part story, "Black Widow: Bad Blood," released its first two parts today. Future installments will release weekly, with listeners able to purchase the entire "season" for $9.99. Check out the cover art and the official synopsis below:

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Someone has stolen the Black Widow’s blood. Now she must find them before it’s too late.

As Natasha Romanoff follows the trail across the globe, she discovers she wasn’t the only target. Whoever is responsible stole Bucky Barnes’ blood, too. And one thing is certain: anyone who wants the blood of the Widow and the Winter Soldier needs to be taken down, and fast.

Despite a tangled web of shared history stretching back to their Red Room days, Barnes and Romanoff must join forces, confronting the demons of their past as they race to protect their future. A single drop of blood could be all it takes to save the world—or destroy it.

The series is narrated by Sarah Natochenny, the English voice actor of Ash Ketchum on the Pokémon anime, and written by a group led by Lindsay Smith (Orphan Black: The Next Chapter). Black Widow: Bad Blood is the second Marvel title to debut on Serial Box; the first, Thor: Metal Gods, is currently available on the platform. A future installment will focus on Black Panther, while Jessica Jones: Playing With Fire will launch on May 28th.

Marvel's Black Widow: Bad Blood is available through the Serial Box app on Google Play and the Apple App Store as well as the Serial Box website.

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