These are pretty straight mysteries- no fantasy/scifi crossovers!

Bellairs, John - sometimes a hint of horror like ghosts, but mostly mystery.

* The Mansion in the Mist

• Trolly to Yesterday
• Chessman of Doom

Cooney, Caroline B : lots of titles including

* Face on the Milk Carton

• The Terrorist
• Burning up

Hoh, Dianne : Writes series called Nightmare Hall titles include

* Deadly Visions

• The Biker
• Truth or Die

Roberts, Willow Davis :

* View from the Cherry Tree

• Caught
• Scared Stiff

Need to work on:

Horowitz, Anthony

Three of Diamons

Diamond Brothers

Van Dreannen

Sammey Keyes

Henry, Sue

Beldon, Trixie

Korman, Gordan

Patterson, James

Maximum Bid

School's Out Forever

Christie, Agatha

Cooney

Chasing Vermeer

nancy Drew

Hardy Boys