Flo and his trusted Collie pal Lassie spend the summer at Aunt Cosma's, alongside her foster children Kleo and Henry, and her dog Pippa. When local canines start disappearing, including Pippa, Lassie rallies the kids to solve the mystery.
Mother Lissy, father Gerd, son Tom and daughter Ellen: the members of the Lunies family are estranged. But confronted with death, they finally meet each other again.
Toni (Sarah Engels) falls in love with Tom, but he has a dark secret.
