The Cousins offers a straightforward mystery to solve. Greed, vengeance, disguise, family money, inheritance, lovely young adult romance, three cold-blooded murders, and an accidental death are all present. — Milly, Aubrey, and Jonah are cousins, but they have never met. Previously, a single letter impacted the lives of their parents and their parents' siblings. Mildred Story, a wealthy, quirky grandmother whom they never met. Before they were born, she disinherited their parents. Now, in a similarly detached letter, she…