Widower Mark Bishop commands the USS Nevada, a ballastic missile submarine. Gina Gray, sister of Mark's friend Jeff, is a young, gifted ocean scientist whose world revolves around making submarines safer while she dreams of being of finding a husband. Despite the difference in their ages, Mark and Gina's friendship grows as they work together on her most recent and secret project.
There is a lot of excitement as Gina's military surveillance project is tested during the threat of war in the Indian Ocean and some Christian comments as Mark considers his relationship with Gina and plenty of information about submarines. This is a continuation of Henderson's 2013 book Unspoken.