20 stories. 20 mysterious situations. 20 brave kids. 2 books in 1 volume. Kane’s parachute fails during a skydive. Was this sabotage? Mercer stole a secret message. Now two spies are hunting him. Charlene’s escape room gets hijacked. Can she find the traitor? Jack Heath’s twenty nail-biting and mysterious short stories will intrigue and terrify during each 20 and 30-minute countdown in this bind-up of two books, as dangerous situations play out right down to the last crucial moment.