Book 5 in the Ryker Returns series.
"James Ryker and his protégé, Henrik Svenson, travel to the small alpine town of St Vincent, recently rocked by the triple murder of a prominent family. The sole survivor of the horrific crime, teenager Sophie Thibaud, has since been cared for by her aunt. Upon their arrival, however, Ryker and Svenson discover that Sophie is now missing too, and it’s not long before Ryker uncovers evidence of a wider conspiracy at play."