The Ehrich Weisz chronicles : demon gate

"Ehrich Weisz--the future Harry Houdini--follows his brother Dash into a strange alternate New York where the immigrants are from different dimensions."@en
"When young Ehrich Weisz-- the future illusionist, Harry Houdini-- follows his brother, Dash, through a strange portal, he is thrust into an alternate New York where the immigrants aren't just different ethnicities but different species. He finds work in this strange steampunk world as a Demon Hunter, tracking down dangerous otherworldly visitors that threaten the city's safety, while hiding his own foreign origins. A curious medallion, his only clue to finding his brother, leads Ehrich to a mysterious woman caught up in interdimensional intrigue, and he must learn who to trust as he unravels the truth if he ever wants to find his way home."