A Rugged Beauty - Lacy Williams

Hollis Tremblay has no memory of why he's out in the wilderness alone or whether the woman with him is his wife. She's beautiful and her rosy outlook makes everything seem brighter, even the dangers they face...
When Hollis's memory crashes back, he realizes that Abigail is the sister his childhood best friend charged him with looking after across the dangerous westward journey. Abigail might be a ray of sunshine, but she's strictly forbidden. Especially to him.
But when the company realizes that Hollis and Abigail have grown close while marooned in the wild, he may find himself ensnared in a marriage of convenience...