Jonas Ambler is a rich businessman whose wife is killed by kidnappers, so he decides to get even. He hires a mercenary to find and kill the kidnappers. There's only one catch --- he wants to go with them.
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Mercenary is an adjective meaning "motivated by private gain".
It is also a noun: a mercenary is a person primarily concerned with making money at the expense of ethics, most often used to refer to a soldier who fights for hire.