series of unfortunate events discussion

In The Vile Village, Isadora and Duncan Quagmire use a code within couplets to send a message to the Baudelaires about their location. It is necessarily to said that Isadora and Duncan are members. It is possible that Duncan and Isadora learned about some of the V.F.D codes when they were kidnapped by Count Olaf. In The Vile Village, Isadora wrote four couplets:

For sapphires we are held in here
Only you can end our fear.

Until dawn comes we cannot speak
No words can come from this sad beak.

The first thing you read contains the clue:
An initial way to speak to you.

Inside these letters the eye will see
Nearby are your friends, and V.F.D.

The first letters of each line spell out “FOUNTAIN”, referring to Fowl Fountain where they were held hostage by Count Olaf. They sent the messages by tying them to the feet of crows that flew from the fountain to the Nevermore Tree each night.

Then one word in the poem completes the code in this case "beak" which was the part of the fowl fountain where the Quagmire triplets were held.