The only one

This book contains three short stories:

1. Dark Descent by Christine Feehan (11 in her Dark Series) an aggressive, multi-talented professional body guard/secret service agent who never lets danger or the unknown stop her becomes the lifemate of a powerful immortal embroiled in a battle with the vampires.

2. The Star Queen by Susan Grant is the first in her Star series.
A munitions developer/producer finds love with a rebel leader who begins the peace process in one corner of the galaxy.

3. Sacrilege by Susan Squire (a spin-off her Sacrament, the vampire heroine (a recovering "addict") is quite strong but generally seeks to avoid rather than embrace adventure.