Wasting Time ... Book 2 in the Physics, Lust and Greed Series - Mike Murphey - Bog

When time travelers fail test after test to significantly alter the past, most financial backers abandon the Global Research Consortium leaving veteran traveler Marta Hamilton to administer a vastly scaled-down project. She must protect the past from a greedy future, fend off political meddling, and foil a murder plot originating in a parallel universe. She presides over a conspiracy to hide the truth of her best friend's death while coping with a confusing and discomforting romantic entanglement involving fellow traveler Marshall Grissom.
Marta, who has by professional necessity always distanced herself from emotional commitment, lapsed by allowing herself the luxury of friendship with Sheila Schuler and a night of wild sex with Marshall. Now, Sheila is probably dead, and-according to a genius physicists' theory-Marshall soon will be. As she assumes her role as administrator of the time travel program, Marta must choose between the risks of loving someone, or the lonely safety of emotional solitude.
(No cats were harmed in the telling of this story.)