Too Many Chiefs - S7.E16

After dropping off a girl at a children's home, Dave and Cathy get called back in for a potential suicide. The girl Dave brought back in the morning seems to be the last person to see the dead girl alive. The man in charge of the home resigns. The dead girl had a boyfriend who, according to her diary, took her to Spain and Wales as well as other places. There was an unreported break-in. This and some photographs the disappearing girl had seem to be connected to the suicide.