Dark Devotions by Nichole Greene

Once upon a time they were my best friends, my family, my soulmates. But this is no fairy tale and I have nothing left to lose.

Beaten, bruised, scarred, emotionally traumatized. Olivia finally found a way to escape her sadistic husband. Now broken and penniless, with nowhere else to turn, she seeks out the four men who always protected her when they were younger. But can they come together and help her heal from the damage wrought? She loved them all once, will she again after being held by the devil’s embrace?

Sawyer, Nolan, Lake, and Grant share more wealth and power between them than the majority of the civilized world. But when an old friend comes back into their lives, they find themselves sharing more than a substantial plan full of revenge for the man that tried to break her. Each with their own set of skills but none able to resist the woman that needs them most. Vowing to protect her, the lines are blurred into murky shades of gray as secrets unfold and five hearts are on the line.

Reader beware: this is a dark reverse harem with triggers (SA, domestic violence, death) none of which the heroine suffers at the hands of her four men or in great detail.