Rory the dragon and his best friend Flora share a love of flyling and bicycles, so they are shocked when they discover a mountain of discarded bikes, and appalled when they realise that rust from that mountain is running into the dragon clan’s drinking and gardening water. More and more children start discarding their old, sturdy bikes in favour of brightly-coloured, plastic, inflatable, single-use replacements which look great (they even sort-of fly) but pop easily and cause injuries on impact – facts which are of no concern to Evilyn the Entrepreneur. It’s up to Rory and Flora to put an end to Evilyn’s schemes and repair and recycle all the damaged old bikes, before anyone gets seriously hurt.