In Ways We Can't Imagine, Book 1 in The St. Germaine Chronicles

When Arranah loses Kendal, the one she loves more than herself, she nearly takes her own life. Instead she learns of legends, a multidimensional conduit and a way to be with him...with a catch anchored in an ancient matrix. But first she has to learn of its existence and a way to live without him. For it all to work she must find the link she does not know exists and another woman whose life and love are also closely bound to the mountain.