Kilts In The Wind. Clash of the Tartans, #5

An amusing and heartwarming tale of mistaken identity, a derelict windmill, and a wee lad who eats like a horse. In order to get the hated Lockies to agree to refurbish the derelict windmill that sits on the border between their lands, Spenser McDool must wed Jane, the Lockie laird's daughter. The successful processing of a bumper harvest depends on it. He's never met Jane (or so he believes) but has fallen hard for a scullery maid named Jennie who visits the mill. Jane disguises herself as a servant when she escapes the cruel tyranny of her stepmother for a short while.
She is unaware the man she meets at the mill and falls in love with is the laird of the hated McDool Clan.