High Tide — R.L. Stine

Blood on the water. . .

Adam Malfitano still has nightmares about the night his girlfriend, Mitzi, died. He sees the blood. He sees her in the water. He is a lifeguard, and he can't save her. He wakes up screaming.

Even worse, he has begun to see Mitzi while he is awake. He knows it is impossible...but she looks so real. He can see her face decaying. What does she want from him? Why won't she leave him alone? He tried to save her -- doesn't she know that?