When Jack invites a group of scientists to visit, they bring their children as well.
But two of the scientists have plans other than studying algae.
By the time Nim discovers what they really want, and what they will do to get it, the children are in grave danger.
![Operation easter egg [with one sheet of stickers], paperback/natalie shaw](https://mcdn.elefant.ro/mnresize/350/350/is/product-images/carte-straina/ingram/20200404/13773554/99ff/4318/a3e4/697e0c6ca68d/13773554-99ff-4318-a3e4-697e0c6ca68d_1.jpg)
