A significant event is when Winnie accidentally discovers the immortal Tucks in the forest, and they have to hold her captive until they explain the situation.
The Tuck family is immortal, but they wish they were not. Father Tuck even dreams of being in Heaven, instead of immortal. Mae Tuck explains to Winnie that the secret is not an easy one.
It’s a big, dangerous secret. We got to have your help to keep it. (p. 43)
Although Jesse sometimes makes light of the problem, the rest of the Tucks have grown tired of being immortal. They long to be like others. They do not keep their secret out of selfishness, but out of fear. They worry what would happen if anyone found out about the spring that makes you immortal. So they devote their lives to protecting it—forever.
Before meeting the Tucks, Winnie is frustrated with legacy and heritage. Her family has been on the same patch of land for a long time, and is staunch and respected. Winnie longs for affection and softness, and finds it with the Tucks, who ironically have lived in the same place for as long and will continue to do so forever.