Marvin's Curse

How would you handle the dead? After losing his dad, 17 year old Marvin finds he can see and talk to the dead, an inherited 'gift'. Bonus, you might think, but Marvin hates it. It makes him different and he just wants to be 'normal'. He meets Stella in the graveyard that backs onto the house he's just moved into. 'My name is Stella, Stella McCartney. It says so inside my trousers.' (!?!)
A mysterious business card reveals that Stella has lost her memories and all signs point to Moghador, a gateway to hell where a pawnbroker holds the answers. And Stella is DEAD! She just doesn't know it... yet!