The Substitute Bride (Heartsong Presents)

is book #1058 of the Heartsong Presents line.
==Book Description==
Jared Callahan's mysterious bride 
Rancher Jared Callahan eagerly awaited the arrival of his mail-order bride. But instead of the kindhearted woman who wrote about escaping her constrained city life, the beauty who arrived in his remote frontier town couldn't remember anything. Not him, not their long-distance courtship, not even her own name. What is he going to do with this petite spitfire? 
Dazed and confused from a railway accident, Rebecca Layne finds herself saying "I do" to the handsome stranger who claims to be her betrothed. But as feelings for Jared blossom, the mysteries of her past threaten to unravel her life at the seams. Only when the truth is finally revealed can this marriage of convenience ever become a true union of love.
(Description from harlequin.com)