For more about the PBS series Masterpiece Mystery! click here. For more about Kenneth Branagh and the Swedish detective he plays in Wallander, click here. You can even watch “Sidetracked” the premiere episode of the series online by clicking here. The next installment is titled “Firewall” and it premieres on PBS Sunday at 9pm eastern. Wallander is based on the global bestselling books by Swedish writer Henning Mankell.