Well, if you can't even trust a hitman..

TOKYO (Reuters) - A Japanese woman called in the police after a hitman she paid to kill her lover's wife failed to carry out the job.
The 32-year-old Tokyo woman was arrested Wednesday for incitement to murder, the Daily Yomiuri newspaper said Friday.

The woman contacted a private detective through a Web site last November and paid him 1 million yen in cash to murder her love rival, the paper said.

The 40-year-old detective accepted the money and suggested he could carry out the job by chasing the victim on a motorcycle and spraying her with a biological agent in a tunnel.

Police also arrested the private detective and found the alleged target safe and well, the paper said.