The Edge of the Water — Elizabeth George

A mysterious girl who won't speak; a coal black seal named Nera that returns to the same place very year; a bitter feud of unknown origin -- strange things are happening on Whidbey Island, and Becca King, is drawn into the maelstrom of events.

But Becca, first met in The Edge of Nowhere, has her own secrets to hide. Still on the run from her criminal stepfather, Becca is living in a secret location. Even Derric, the Ugandan orphan with whom Becca shares a close, romantic relationship, can't be allowed to know her whereabouts.

As secrets of past and present are revealed, Becca becomes aware of her growing paranormal powers, and events build to a shocking climax anticipated by no one.