Six films to watch this week

Paul Greengrass’s ★★★★★ ‘The Lost Bus’ stars Matthew McConaughey in a drama of true-life heroism; Cillian Murphy heads a school for young offenders in ‘Steve’ (★★★★★); Margot Robbie and Colin Farrell are brought together by a cosmic satnav in ‘A Big Bold Beautiful Journey’; a Syrian exile on a mission makes ‘Ghost Trail’ a strikingly good thriller; ‘Spinal Tap II: The End Continues’ relives the comically earnest tone of the original; ‘Downton Abbey: The Grand Finale’ is a big-screen nostalgia fest — reviews by Danny Leigh