Warehouse 13

In the season two premiere, we pick up right where we left off. MacPherson has blown Artie to smithereens, and disappeared. Is Leena really a traitor? Where has Claudia gone? How will Pete, Myka and the Warehouse fare without Artie? What other havoc did MacPherson wreak when he was alone in the Warehouse? And is there yet a new villain on the horizon?