"When best friends Abbi and Skylar witness a clandestine meeting between a mysterious woman and someone in a dark van, they're thrilled. Finally, a mystery to spice up the summer! Who could these people be? Why are they meeting? Are they spies? Criminals? The two girls are determined to find out. But then a local woman goes missing and is found dead in the woods. And Abbi and Skylar realize that their detective work could hold the keys to solving...

Ginny is unhappy when her family moves from Chicago to upstate Michigan for the summer; her father has a job restoring a 1930s mansion, but there are rumors about Woodmoor and the forest next to it: rumors about strange mutant creatures; Ginny, an aspiring mystery writer, is soon half convinced that the rumors are true, because something or someone is haunting the house--and she plans to investigate, with the help of Will, the older boy who lives...

A group of sixth graders participating in an annual Halloween tradition to pacify the ghost of Abigail Snook quickly realize that the Bellwoods contains an even bigger threat to their town.

"Trapped with a train bearing down on him, Cal's chances of survival look grim. The cops and criminal gangs are unrelenting--they want him behind bars ... or dead. The stakes are getting higher, but all the slues to the Ormond Singularity just lead to more puzzles, and more danger. Thwarted at every turn, it seems Cal has no hope of finding the answers. Is there anyone he can trust? The clock is ticking. Any second could be his last"--Publisher.