Almost 15 per cent of the Philippines' adult population, about eight million people, live and work overseas.The money they earn is vital to the economy, last year more than $17bn dollars was sent back in remittances.But the cost proves to be too high for some of the migrant workers that find themselves suffering the abuse at the hands of their employers.About two million Philippine workers reside in the Middle East, including Saudi Arabia, where the Philippine government says that it will investigate a recent case that led to the death of one maid.Al Jazeera's Marga Ortigas reports from Manila.