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Thirteen-year-old Siena's visions of the past intensify when her family moves to the Maine coast, hoping her little brother will begin speaking, and she connects with residents of the house from many years earlier who faced a similar problem.

In 1963, when twins Henry and Helen and their best friends, Alan and Nicki, try to find Alan's missing brother, Carl, they stumble into the knowledge of their "subtle forms" that can separate from their physical bodies, and into a criminal's plot to make himself immortal--at any expense.

"The Greystone kids thought they knew. Chess has always been the protector of his younger siblings, Emma loves math, and Finn does what Finn does best -- acting silly and being adored.

"12 days since Mrs. Greystone and Ms. Morales were reported missing 4 children who are determined to bring back their mothers and 2 worlds .

"In 1995 Kailua-Kona, Hawaii, on a rare family vacation, 7-year-old Nainoa Flores falls overboard a cruise ship into the Pacific Ocean.

Told from separate viewpoints, as evil forces from the parallel world invade their home, the Greystones, their doubles, and friends must return to the alternate dimension to save both worlds.