With winter over, the animals of the Drift awake to a new season, and with the mystery of the treasure map solved, they look forward to a quieter life... or so they think! Rollie, Toby, Donie, and Rowan enjoy a picnic on the river, all is quiet and peaceful, until Rollie discovers a bottle in the water with a worrying message in it....Help me! Is this just a trick or is there really someone in trouble in the Drift? Rollie sets out to discover the truth and finds himself in real danger again, as there are others trying to solve the mystery before him and they will stop at nothing. With the help of his friends, Rollie tries to break the mysterious code and find the hidden treasure, as the fiendish Sykes and Lenny close in on the truth!