Cost of Attainment (Rules Duology, #2)

Cost of Attainment (phrase)
The price paid, or the exertion required, to obtain a desired outcome.
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Carver
Carver never expected to end up on an assignment with his ex. He also never expected to be left behind.
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Clara
After her previous assignment, Clara is left picking up the pieces. If she could change things, she would, but some decisions are made far too late.
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In the thrilling conclusion to the Rules Duology, Carver and Clara learn that every action has a price. While Carver is grappling with the results of his decision, Clara is sent on another assignment. This time, the assignment involves a friend, an enemy, and a stranger. Will this mission be as devastating as the last?