This book is the sequel to Alone!, a story of 6 girls who are sent on a week-long cruise that leaves them stranded on an uncharted island with their slightly older Caribbean guide. When this story picks up the girls have been on the island for about 4 months and have pretty much settled in to island though they spend almost all of their time building a boat to carry them away from it. When yet another storm takes yet another boat from them the story starts really losing its momentum and becomes a little far-fetched. the impassible lagoon is suddenly able to have a raft leave and then a rescue ship come in unharmed - it conflicts with everything that had been built up before it.
Aber apparently was not able to fit all of her story of the Lost Girls into one book, but did not have enough material for a true series. The editors should have had her combine the two. The real reason for reading this book after Adrift is simply for some closure.
Why 4 stars?:
The characters have become too similar and boring. The events are more interesting, but become a little fantastic. If you haven't read the prequel, I wouldn't bother with this one. Still, it is entertaining and not poorly written. Anything that gets a child to read is worth having on your shelves.