Heart of the Matter by Ruth A. Casie

Digging into the past can be murder.
Addison Moore, a well-known psychiatrist, is having difficulty coming to terms with the death of her grandmother, Cookie. The woman was everything to her after her parents died in a plane crash over Lockerbie, Scotland. Little did Addy know, an old picture tucked away in the family bible of Cookie with a handsome stranger would lead her to a discovery for which she is little prepared.
Ethan Taylor is an art historian. He’s lived with his Great Uncle Ben for a long time and would do anything for him. He never anticipated Ben’s dying wish would introduce him to his biggest sacrifice.
Neither Addy nor Ethan are prepared for the lengths their families went through to keep Cookie and Ben apart. As they put the pieces together, they uncover a decade’s old unsolved murder implicating Cookie and Ben. Will Addy and Ethan’s blossoming love be able to stand the strain of finding the truth? Will they be able to get to the heart of the matter?