Ideas for thriller title

From research we came up with five titles for our thriller that would represent it in the intended way. The group wanted the thriller name to bring up a sence of enigma and suspicion. The suggestions were taken into a poll to see which would be the most popular name:

1. Criminal conversation
2. The Resentment
3. Infiltrator
4. Acquaintance
5. Affinity

The votes varied however the majority of the vote were between titles two and five. 'Criminal conversation' is another word for adultery. 'Infliltrator' is defined as an intruder with hostile intent. 'Acquaintance' is defined as personal knowledge or information about someone or something. Affinity is defined as a natural attraction or feeling of kinship. 'Resentment' is defined as a feeling of deep and bitter anger and ill-will; which would connotate our ideas of the thriller film in a very good way.

On review of our thriller title we were adviced to change the name from 'The resentment' to simply 'Resentment' as it is more gramaticaly correct.