The English Lieutenant's Lady — Ava Stone

Phoebe Greywood has waited quite a while for her betrothed to return home from the Peninsular Wars, but when he finally does, she's heartbroken to discover he's changed in more ways than one. Most alarmingly, he doesn't seem to care one whit about her anymore. But one man who hasn't changed a bit after his time on the continent is her betrothed's boorish brother… Lieutenant Tristan Avery would like to pound some sense, or perhaps honor, into his older brother. Why the cad treats Phoebe so callously, Tristan can't understand. But what he truly can't understand is why he suddenly seems drawn to the chit as they've never been fond of each other. When the truth of Tristan's feelings for Phoebe become clear, his own honor is put to the test and all of his plans for the future are turned upside down.