Alpha Liam's Escort

"You're disgusting!" Celeste screamed.
"How could you do this to me? Both of you!" Tears fell from her eyes once more. "You were my best friend, and you..." Her gaze shifted to Amara, who cowered behind Julian. Then, Celeste snapped back to Julian and stepped closer to him.
"I, Celeste Foster, reject you, Julian Cross of the Shadow Pack, as my mate."
After experiencing the double betrayal of her mate and friend, Celeste thought her life couldn't get any worse, until she woke up naked next to Liam Blackwell, Alpha of the Nightfall Pack...
Liam never thought he would have a one night stand with Celeste. Everything happened too suddenly, and when the heartbroken Celeste approached him and whispered "I want you," Liam knew he couldn't refuse such an offer.
As Liam is irresistibly drawn to Celeste, he begins to notice that she seems close to someone he never thought he would encounter: first Julian, the Alpha heir of the Shadow Pack, and now Nathaniel Stone, the Alpha heir of The Obsidian Pack.
Was Celeste hiding a big secret about who she was?