 In July 1637, Anne gave 
du Fargis the mission to examine whether there was any truth to the rumor of an alliance between France and England, as this would force Spain to cut off diplomatic connections to France and disturb her network of couriers between the Spanish embassies of Paris and Brussels.On 11 August 1637, Anne came under so much suspicion that Richelieu issued an investigation.Her courier La Porte as well as the abbess of Anne's favorite convent Val-de-Grâce (where Anne had written many of her secret letters) were questioned and admitted to having participated in channeling the queen's secret correspondence.