Sunset by Amy Lane

Larx and Aaron have faced a lot together—small-town prejudice, work injuries, and pregnant daughters. But finally two of their teenagers have graduated and Larx is making moves to lessen his workload in anticipation of Aaron being elected sheriff in the fall. Maybe, just maybe, they can start planning the wedding they’ve longed to have.
Then a student goes missing and Aaron’s mentor takes a bullet during the search. Larx and Aaron backburner their plans and jump into what they do best—taking care of their people.
They don’t expect to be the ones who end up in danger.
While Larx and Aaron struggle to get out of their perilous situation, their family is galvanized into action. Just like Larx and Aaron’s relationship, their rescue is going to take hard work, ingenuity, and a solid sense of humor, but the people whose lives they’ve touched are up for the job. Nobody will rest until Larx and Aaron are safe and sound—and ready to ride off into the sunset toward the beginning of the rest of their lives.