Genie and the Sandman. The Diary of Payton Wren, #2

After an exhausting journey through an alternate dimension, Payton Wren and Logan McCullough thought they had finally reached home, only to discover three glowing moons shining down on them from the sky. Though this new world is almost identical to their own, the pair make the decision to flee and re-enter the labyrinth of tunnels. Before they make their escape, Logan's mother discovers them. In this world, unlike their own, Logan's mother has not left her family.
Logan decides to remain and find out what went wrong, much to the dismay of Payton, who is anxious to leave. Payton learns she has the ability to grant wishes. Federal agents, who will do anything to obtain the secret of the well, covet her gift. When the pair is only one wish away from returning to their own world, tragic, unforeseen events land them in a new dimension where Payton has the ability to enter other's dreams.
A gift that may rescue them from a fate worse than death.