Excellent.

The chase takes them to Glacier National Park. A Grizzly shows up.

Shadow Woman (1997) is 3rd book in the Jane Whitefield series by Thomas Perry.

Jane Whitefield is a Native American (Seneca) who has made a career out of helping people disappear.

When her latest client, a Las Vegas gaming executive who has lost the trust of his criminally-connected bosses, asks for help, Jane Whitefield gets him out of town with a spectacular display of casino magic.

Then she keeps her promise, gives up her dangerous trade, marries her loyal doctor, and settles down to live peacefully in upstate New York.

As if.

… her client screws up.

Jane’s highly developed code of honor makes her leave her bridal bed to rescue him from an eerily psychotic Los Angeles couple who use everything from sex games to attack dogs to track him down.