[EDIT] A sheltered American teen, kidnapped by a Bangkok crime lord, is groomed first as his protégé, then as his bride — but when she discovers he was her late mother’s secret lover, she uses his methods to destroy him and seize his empire.

Clarification: my response applies to the "... she turns his brutal methods against him to seize his empire."

Better of the two, IMHO. And at 23 words in length, a quick and easy read.

Or this:

When a naive American teen is kidnapped by a Bangkok crime lord, she must use his brutal methods to destroy him and seize his empire.