Quite a popular sci-fi read, 4.5 stars. Also worth mentioning you can get $5 of Kobo credit using the referral link above.
Edit: apparently lots of referral links have expired, please keep on pressing the below random referral link until you get a valid one.
Kobo has quite some good deals, eg:
A popular title at a reduced price (often $4.99 - use your referral credit for this!)