Three Made In Heaven by Elena Kincaid

Maddie Sutton always felt something missing until the day she met Charlie and Cole. What started out as a childhood friendship slowly developed into an all consuming love. Her biggest problem is that she can only see them in her dreams. Maddie realizes that to lead a normal life, she would have to let them go. After all, they’re only a fantasy…or are they?
Charlie Gilbert and Cole Mercer are both very real. For years they have loved and pined for Maddie, meeting up in dreams set in different locales. Afraid of making her choose between them, they keep their feelings hidden until finally realizing that the three of them belong together. How can they convince Maddie if she doubts their existence? When Charlie starts to doubt, Cole springs into action and brings them all together.
Now that they have found each other, they vow to never let go, but when an unknown danger looms over Maddie, Charlie and Cole will do anything to protect her even if it means risking their own lives.