All or Nothing is Book 5 in the Madison Falls series by contemporary romance author Susan Behon. Christopher King had everything. He had his family, his security company, and most importantly, he had Fiona O'Malley. Almost. Until he has to let Fiona go for reasons he can't reveal.
He thought he'd shut her out, but every stolen look and lingering glance gives him away. Fiona knows things aren't as they seem, so she comes up with a plan to get Chris to tell her the truth. It works a little too well when the very reason he stayed away comes to light and threatens everything he's fought to keep safe.
Unable to live the lie any longer, Chris needs Fiona by his side to put a stop to the danger that's following her and tormenting him. Fiona becomes the key to unlocking his every secret, including the love he can no longer deny.