Guardians: The First to Fall

Kara Ferguson is dead.

People saw her jump off a building and land on the street 34 floors below. But Kara is still with them.

She wakes up next to her mangled body, and follows the mysterious hooded figure away from the crowd. She is then led to Purgatory, the land of limbo, and there she will be judged. Due to committing the sin of suicide, Kara is sentenced to 100 years of community service, standing as a Grim Reaper, Purgatory's equivalent to soldier.

Collectively, they are called the Purge, and they are under the Archangels, Heaven's equivalent to Generals of an army. Here Kara meets Gotham, one of Heaven's Generals gone rogue. Fights and arguments ensues, but Gotham is forced to work with the new recruit to finish his sentence and get back on his rightful place.

But something is lurking in the shadows, and it is up to the unusual duo to banish this monstrosity before it's too late.
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Seriously amazing job @BreeRathbone for the book cover! Check her out!