A Killing Frost (October Daye Series, Bk. 14)

When October is informed that Simon Torquill - legally her father, due to Faerie's archaic marriage traditions - must be invited to her wedding or risk the ceremony throwing the Kingdom in the Mists into political turmoil, she finds herself setting out on a quest she was not yet prepared to undertake for the sake of her future.... and the man who represents her family's past.