Stars in Your Eyes by Lynn Kurland

Imogen Maxwell is on a hunt for rare, antique items to use on a period movie set. The last thing she expects to discover in the peaceful Scottish countryside is a pristine medieval sword…or to suddenly find herself facing its very vintage owner in a far too authentic castle.
Phillip de Piaget has run out of patience with his recalcitrant Scottish betrothed and is determined that she will join him, once and for all, in front of the altar. Only the lass he captures fleeing his would-be keep seems more interested in running away from him than talking to him. In fact, she seems to have no idea who he is.
But taming his reluctant bride is the least of his worries; it seems someone else wants him at the chapel…in a stone box. As for Imogen, how can he let her go, when she holds the key to not only the castle, but his heart?