Audiobook Without a Trace: A Sara Vallén Thriller, written by Cecilia Sahlström. Chief Inspector Sara Vallén receives a tip that could help solve a 20-year-old cold case about a two-year-old boy who disappeared from his preschool without a trace. Meanwhile, Sara’s daughters Klara and Bella are being harassed by a group of young Nazi sympathisers for starting a student association supporting unaccompanied refugee youths.