Werewolf of London

Dr. Wilfred Glendon (Henry Hull) is in Tibet searching for the rare mariphasa plant that apparently only blooms under moonlight. Upon finding the plant, his joy is short-lived as he is attacked by a half-man half-wolf type creature. He manages to fight off the creature but it draws blood before retreating off into the mountains. Back in London, Glendon works tirelessly to get the plant to bloom under artificial light, neglecting his wife Lisa (Valerie Hobson) in the process.