Definitions for "Connivance"
Intentional failure or forbearance to discover a fault or wrongdoing; voluntary oversight; passive consent or coöperation.
Corrupt or guilty assent to wrongdoing, not involving actual participation in, but knowledge of, and failure to prevent or oppose it.
(law) tacit approval of someone's wrongdoing
The act of ignoring a wrongdoers criminal or otherwise illegal conduct.
A legal finding of connivance may be made when an accuser has assisted in the act about which they are complaining. In some legal jurisdictions, and for certain behaviors, it may prevent the accuser from prevailing.
Keywords:  plot, secret, agreement
agreement on a secret plot