Hearts. Aces Underground, #4

They followed the truth down the rabbit hole. Now escape comes at a deadly cost. Bianca Montrose always knew her sister's world was built on secrets. What she didn't know was just how far that darkness went or how much evil it hid beneath the surface. When Bianca finally uncovers the truth behind Aces Underground, it shatters everything she thought she understood about loyalty, ambition, and family. Harrison O'Rourke has already risked his life chasing answers.
Now the stakes are higher than ever. What began as a search for missing friends has turned into a fight against a powerful network that thrives on control and eliminates anyone who threatens to expose it. He's determined to protect Bianca, the woman he loves, from all of it. With danger closing in from every side, Bianca and Harrison form an uneasy alliance with a man who plays no one's game but his own.
But trusting him may be as deadly as going it by themselves.