French woman Florence Cassez could soon be freed from a 60-year prison sentence in a Mexican jail after a judge decided her conviction was unsafe.
Thirty-seven year old Cassez was found guilty of kidnapping and other crimes in 2008.
However, Mexico’s Supreme court is now to review the case which has been a growing source of diplomatic tension between France and Mexico.
A panel of five judges will give their decision in two weeks time.
The challenge comes from a legal report which claims Cassez was denied a fair trial and that witness statements used to convicted her were unreliable.
Cassez was arrested in 2005 and accused of being part of a kidnapping gang called The Zodiacs who were led by her former Mexican boyfriend at the time.
Mexican anti-crime activists oppose her release
saying a message must be sent to kidnappers while others see her as a victim of injustice.