just nick it

there is nothing new under the sun.
don't be afraid to steal someone else's idea - just make sure you do something good with it.
it happens all the time. sometimes it is an 'adaptation' think of 'magnificent seven' and 'seven samurai'. or there are homages think of 'skizz' and 'boys from the blackstuff'. in the world of music it is called variations on a theme.
copies, homages, plagarism - call it what you will but there are times when you have to play with someone else's toys.
don't think of it as cheating - you can learn from it.
what is it you like about it?
what don't you like about it?
do you like the structure?
can you improve the pacing?
is it the characers? is it the settings? is it theme. is it the descriptions?
(this works for all forms of creativity - doesn't matter what you are doing you can always steal from somewhere else).

so if you are stuck for inspiration - go steal it from someone else.