"A really good detective never gets married." - Raymond Chandler Many detectives would take Chandler's edict to heart, given just how married they are to their jobs, and the bookshelves are lined with detective novels about grim gumshoes who forsake their own personal lives in pursuit of catching killers. After all, detectives are prone to seeing the worst of humanity on a daily basis, of seeing the skull beneath the skin, companions as they are of death and murder. Enter Kurt Wallander (Kenneth Branagh), a detective in the seaside town of Ystad, Sweden who--like many others of his ilk--has his own horrific demons to battle even as he throws himself into chasing criminals with intense abandon. And while we've all seen stories of flawed detectives a zillion times, PBS' Wallander , a co-production between WGBH and BBC which kicks off on Sunday night as part of Masterpiece Mystery , offers a tautly gripping and suspenseful roller coaster ride through the dark heartla