(Paperback)

"Mr. Summerling has left Marly, Sai, and Isla a set of brand-new clues to follow, including tickets to the mysterious Summer Island, where they hope to finally discover what lies at the end of the treasure hunt."--

(Paperback)

"Join Marly, Isla, and Sai, three code-cracking kids on the hunt for an old neighbor's hidden treasure"--Provided by publisher.

(Hardback)

"Join Marly, Isla, and Sai, three code-cracking kids on the hunt for an old neighbor's hidden treasure"--Provided by publisher.

(Paperback)

After their shocking discoveries on Summer Island, Marly, Sai, and Isla have one final set of clues to follow before reaching the end of their search.

(Paperback)

"After finding Mr. Summerling's secret tree house and forming the Treasure Troop, Marly, Isla and Sai are back on the hunt. With a new set of clues to follow, they turn to Mr. Summerling's house. With just a few scraps of paper as clues, secrets around every corner, and an unwelcome visitor, the hunt will be a challenge."--Provided by publisher.

(Hardback)

"After finding Mr. Summerling's secret tree house and forming the Treasure Troop, Marly, Isla and Sai are back on the hunt. With a new set of clues to follow, they turn to Mr. Summerling's house. With just a few scraps of paper as clues, secrets around every corner, and an unwelcome visitor, the hunt will be a challenge."--Provided by publisher.