Collecting Jazz Maynard Tomes 4-6 in English. Despite the title, It's not really a trilogy. Tome 4 is a one-shot mafia story set in New York and the Iceland story is a diptych.

From the publisher:

The second volume in the internationally-renowned series, this "second season" takes our intrepid titular character from his home in the seedy ghettos of Barcelona to the icy climate of Iceland in pursuit of an artifact worth a fortune to collectors. But he finds much more than treasure--nationalist groups threaten the area with racial cleansing, threatening the lives of his friends, while also drumming up ghosts from his past. This multilayered noir thriller delves into Jazz's mysterious history, and the time spent in New York, where he honed his skills into the razor-sharp tool set they are today.