Tunnel King

The book I am reading is called Tunnel King. The Tunnel King is a true story about a Canadian fighter pilot who gets shot down and is now in a German prisoner jail. Wally, the pilot. He ends up going to plenty of camps but his plan to escape happens at Stag Luft 3 the main jail. The prisoners dug three different Tunnels but only one got complete. The day before the escape Wally got transferred to a different jail.  The escape still went on, they expected to get 200 men out. The total that got out was 76, 50 of those men got shot in the head and they only know of 3 who got away saftley. So that is what has happend so far and the flat characters are Debby (wallys wife) the other prisoners in the camp( can’t remember their names) and the British soldiers. The only flat character in my opinion is wally, because wally is the only one they explain stuff about.