In the third book of this code-busting series, Marly, Sai, and Isla are back on the hunt! Mr. Summerling has left them a brand-new set of clues to follow, including tickets to the mysterious Summer Island. So with tickets in hand, our trio sets off to their late neighbor’s island. Can they finally discover what lies at the end of this treasure hunt?
 
Available in Hardcover, Paperback and Ebook

126 pages

Penguin Workshop 7/13/2021

Paperback ISBN: 978-0593094884, Hardcover ISBN: 978-0593094891