Martin Seifert

Best friends Bibi and Tina must come to terms with an exchange pupil who cheats to undermine their endeavors to win a geocache search/treasure hunt.

When robbers hit Frankenstein's castle, teen pals Bibi and Tina hunt for the crooks, then devise a plan to save the neighbors' failing ranch.

Bibi and Tina make friends with two young refugees and an Albanian schoolgirl on the run from her family who wants to marry her off.