this is probably a 'young adult' book. so the plot is plain and does not provide surprises, small or big.
from the moment he (jones) boards the ship, you know what is going to happen. this book also reminded me of the short story 'Libby', which is shorter, but moves along these lines.
the one thing i really liked was the flora and fauna of the planet where the ships stops along the way, which still sounds good after 60 years or more.