She was supposed to escape the war. Instead, she sailed straight into the middle of it.
When Japanese forces invade the village where Jessica Henley teaches, she has only one choice.
Run.
With enemy soldiers close behind, Jessica reaches an evacuation convoy and believes she's finally found a path to safety.
Then she discovers exactly what that path entails.
An American submarine.
A secret mission.
And a captain who most definitely was not expecting a woman aboard his boat.
Benjamin Codey wasn't expecting to be captain at all.
When the commanding officer of the Sentinel dies unexpectedly, Benjamin suddenly finds himself responsible for a submarine carrying wounded men, a vital passenger, and a mission so secret that failure could alter far more than the fate of his crew.
Then Jessica appears.
She's exhausted, traumatized, stubborn, and completely out of place aboard a Navy submarine.
At least that's what Benjamin thinks.
He quickly discovers that the schoolteacher grew up as a fisherman's daughter and knows considerably more about boats, sailors, and surviving difficult men than appearances suggest.
And Jessica has a few other surprises.
As the Sentinel pushes deeper into enemy waters, its mission grows increasingly dangerous. Mechanical failures, enemy attacks, wounded men, and the relentless pressure of life beneath the Pacific test everyone aboard.
Then the submarine is damaged.
The crew can repair almost everything.
Almost.
The one skill they desperately need belongs to the one person who was never supposed to be there.
Jessica.
But saving the submarine comes at a terrible cost, and survival leaves wounds that aren't always visible.
Trapped together beneath enemy waters, Jessica and Benjamin begin to discover the people behind each other's defenses.
Benjamin sees strength in a woman accustomed to believing she needed protection.
Jessica finds gentleness in a commander carrying the lives of a hundred men on his shoulders.
And somewhere between depth charges, whispered prayers, impossible decisions, and brief glimpses of daylight, something neither planned begins to grow.
If they survive the mission, however, they'll still have to face the lives waiting for them ashore.
For Jessica, that means a family history filled with old wounds and painful misunderstandings.
For Benjamin, it means admitting that somewhere beneath the Pacific, the unexpected passenger who complicated his mission became the woman he can't imagine leaving behind.
But first, the Sentinel has to make it home.
A Periscope Depth is Book Two of the Brothers in Arms series, a faith-filled World War II military romance of submarine warfare, secret missions, survival, family, courage, and unexpected love beneath the Pacific.