Truth and Lies

Mike''s lies are spinning out of control and now he''s the prime suspect in a murder. He can''t explain his bruised and skinned knuckles, and he can''t explain why he was seen near the park where Robbie was killed. But he insists he''s not a murderer. Still, if Mike really is innocent, why doesn''t his alibi check out, and why are the police so sure that he''s guilty?