Michelle Langstone reviews three films from this year's French Film Festival: A Dash of Love, a charming road trip about two friends with physical disabilities searching for intimacy, aided by a reluctant ex-con turned driver; Case 137, a gripping thriller about a police investigator probing alleged brutality during the 2018 Yellow Jacket protests in Paris, winner of best actress at the Césars; and Guru, a taut psychological thriller about a charismatic life coach whose wellness empire conceals something darker.