All Falls Down (All Falls Down #1)
Ayden K. Morgen

But things aren't as simple as they were then.
For starters, two years of constant emotional abuse has broken Savannah in ways she's not sure can be repaired. And patriarch Matthew Talbot has been murdered, leaving his eldest daughter, Lexi, in charge of a global non-profit and her younger sisters.
Jared Corbit, Lexi's gorgeous boyfriend, is the only thing standing between her and whoever murdered her father. That doesn't stop Savannah from falling in love with him. She knows it's wrong, but she just can't stay away from him when he makes he feel like no one else ever has before.
Finding out his relationship with Lexi is a ruse should make things easier, but when the truth is finally revealed, Savannah's fragile world threatens to fall apart. There's a murderer on the loose, and he's gunning for the only family she has. To save their lives, she and Jared will be forced to make a decision that just might destroy her completely.
How is she supposed to let the man she loves marry another woman?