Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

"Twelve-year-old twins Bickford and Rebecca Kidd and their two older siblings travel to Africa to track down priceless artifacts that will keep the family's treasure hunting business afloat long enough to rescue their kidnapped mother--and possibly find their missing father"--

"The Kidd children--including twelve-year-old twins Rebecca and Bickford--follow mysterious clues that take them from China to Germany, in the hopes of finding their missing father and the treasure that will finally free their kidnapped mother"--

After investigating multiple homicides and her family's decades-old skeletons in the closet, sixteen-year-old Tandy Angel is finally reunited with her lost love in Paris. But as he grows increasingly distant, Tandy is confronted with disturbing questions about him, as well as what really happened to her long-dead sister. With no way to tell anymore who in her life she can trust, how will Tandy ever get to the bottom of the countless secrets her parents...

Eighteen-year-old twins Becca and Cassie, now trained, fearless fighters, hold the key to defeating the despotic United regime and freeing the people of the former United States, but at what cost?

Bick, Beck, Storm, and Tommy have one week to traverse the Australian Outback, locate Charlotte Badger and her pirate cronies, and find evidence to prove their parents innocent of stealing rare opals.

As she fights for the family company, Tandy Angel's detective prowess is called into question and her paranoia builds, forcing her to face the possibility that her stalker could be all in her head--or the very real danger that will finally bring her down.