Hunting for Leenie by Annie Miller

Archer has taken enough lives as a Marine to know his sins were beyond redemption. In his darkest hours, he reaches out to the only person who has been with him through his career, his divorce, and his doubts… his octogenarian pen pal, Charlie.
Charleen “Leenie” knows she needs Archer’s assistance when a land developer relentlessly pressures her grandfather to sell their ranch. While she needs his muscles and mission readiness, what she doesn’t want is his body.
Who is she kidding? Of course she wants the tall, dark, and handsome veteran. Only she isn’t sure she can give her heart to a man determined to live his life without feelings and lives a thousand miles away from her.