The Saint of No Reason. Tulsa Underworld, #7

Sometimes, people with money make foolish decisions. Chandler Reilly's silent business partner, Bill Ruth, is a loan shark determined to ruin Chandler's business and seize everything not shared with Chandler's soon-to-be ex-wife. Neither Chandler nor Bill wants their relationship to become public, especially not to divorce attorneys. When Chandler ends up in jail due to his wife's unfolding plans, the loan shark hires Frank Campos to keep an eye on Chandler and ensure that he fulfills his obligations, meaning Bill gains complete control of Chandler's business.
Ava Reilly has sacrificed everything for the sake of her family, including her dreams of helping Chandler realize his ambitions. Now, she is ready to claim what is rightfully hers. Tired of being pushed around and ignored, Ava must protect the life she has built for herself and her children, even as her husband's shady business dealings and her sister's reckless behavior threaten to upend it all. She is willing to do whatever it takes to survive, even if it means conspiring with her husband's best friend or hiring someone to break into her husband's house to achieve her goals.
In the past, Sierra Mayes relied on her older sister Ava to save her from trouble, even raising Sierra's daughter as her own. But now, with Ava's marriage falling apart-a situation for which Sierra feels responsible due to her succumbing to Chandler's advances-Sierra wants to make amends and foster a stronger relationship with her sister and her biological daughter.