"Viper in Our Midst"
Silver Sable has been hired to bring in Viper/Madame Hydra. As she closes in, then suceeds in the capture, Captain America explains why she can't complete the bounty.
Story continues in Captain America (1968) #419.
"Silver Sable; Early Years, Romatic Delusions"
Silver and the Foreigner wed, then part ways.