The Whistlers (15)

Corrupt cop Cristi is determined to track down the drug money that sultry femme fatale Gilda stole with her associate, mattress warehouse owner Zsolt. Cash is hidden in mattresses, which are exported to La Gomera, headquarters of mob boss Paco and his underworld network. The criminals use Silbo Gomero as a means of secret communication to Cristi must learn the art of whistling too to successfully infiltrate Paco's empire and communicate with the alluring Gilda, who has stolen his heart.