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Marley's best friend has moved to Chicago. The girl misses her very much, writes letters to her friend and waits for a new meeting. However, instead of a reply, she receives news of a meeting with a lawyer. Marley's classmates Isla and Cy also come to the meeting. It seems that Mr Summerling, an old neighbour, has left the three of them a treasure that they have to find using the clues he left behind. Could he have left the children money? Then Marley could have bought a plane ticket to Chicago. But the adventure gives the girl something much more than money - new friends.