Blossom Culp Series by Richard Peck

"More death! More, if you do not stop it. Others lost, like me in the black water. Save them!"When Alexander first sees the eerie glow in the dormer window of the barn, it sets his heart pounding. And when he ventures into the barn in the dark of night, his breath catches in his throat. Suddenly Blossom Culp's words come back to him: "You can make contact with the Unseen...." Now there's a girl ghost standing right in front of him, telling him of great danger ahead... more"More death! More, if you do not stop it. Others lost, like me in the black water. Save them!"When Alexander first sees the eerie glow in the dormer window of the barn, it sets his heart pounding. And when he ventures into the barn in the dark of night, his breath catches in his throat. Suddenly Blossom Culp's words come back to him: "You can make contact with the Unseen...." Now there's a girl ghost standing right in front of him, telling him of great danger ahead. But is there time for Alexander to act on her warning? less

Upon discovering that she has the gift of Second Sight, Blossom also learns that whether glimpsing the future or traveling into the past, one is powerless to alter history.

It's Halloween, 1914. Teenage psychic Blossom Culp sneaks into the house where the rest of her class is having a party-and that's when everything goes haywire. Suddenly Blossom is hurled into a time warp. Her psychic powers have found a way to send her into the future-our time. But will they be able to send her back?

Blossom, high-school freshman and possessor of second sight, helps an Egyptian princess, dead for 3500 years, to regain her tomb, and in addition saves a suffragette school teacher from losing her job in 1914.