The Avengers (1961)

S6E3 Super Secret Cypher Snatch

The issue of a confidential leak from Cypher HQ, along with the vanishing of agent Jarret, is initially passed to the competing Department MII2 before being handed over to Mother's team. However, the mystery deepens when everyone at Cypher HQ insists they've never encountered Jarret, claiming that the only significant event that transpired the previous day was the rain.