The Forgotten Gun

A Metropolitan Police detective about to be dismissed is given a second chance by his old boss, who is now a police commander. He's given a new unit to run and two misfit detectives to assist him. All three know their status is temporary.
Their first case together is an impossible double murder. Each murder is identical. Both victims are expertly shot in the head from long range, but the post-mortems reveal no bullets were used in the shootings. The CSI teams calculate that in both cases th...